<?xml version="1.0" encoding="UTF-8"?>
<!--
CycloneDX Software Bill-of-Material (SBoM) Specification

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
           xmlns:bom="http://cyclonedx.org/schema/bom/1.3"
           xmlns:spdx="http://cyclonedx.org/schema/spdx"
           elementFormDefault="qualified"
           targetNamespace="http://cyclonedx.org/schema/bom/1.3"
           vc:minVersion="1.0"
           vc:maxVersion="1.1"
           version="1.3.1">

    <xs:import namespace="http://cyclonedx.org/schema/spdx" schemaLocation="spdx.SNAPSHOT.xsd"/>

    <xs:annotation>
        <xs:documentation>
            <name>CycloneDX Software Bill-of-Material Specification</name>
            <url>https://cyclonedx.org/</url>
            <license uri="http://www.apache.org/licenses/LICENSE-2.0"
                     version="2.0">Apache License, Version 2.0</license>
        </xs:documentation>
    </xs:annotation>

    <xs:simpleType name="refType">
        <xs:annotation>
            <xs:documentation>Identifier-DataType for interlinked elements.</xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string" />
    </xs:simpleType>

    <xs:complexType name="metadata">
        <xs:sequence minOccurs="0" maxOccurs="1">
            <xs:element name="timestamp" type="xs:dateTime" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>The date and time (timestamp) when the document was created.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="tools" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The tool(s) used in the creation of the BOM.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="tool" minOccurs="0" type="bom:toolType"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="authors" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The person(s) who created the BOM. Authors are common in BOMs created through
                        manual processes. BOMs created through automated means may not have authors.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="author" type="bom:organizationalContact"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="component" type="bom:component" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>The component that the BOM describes.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="manufacture" type="bom:organizationalEntity" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The organization that manufactured the component that the BOM describes.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="supplier" type="bom:organizationalEntity" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The organization that supplied the component that the BOM describes. The
                        supplier may often be the manufacturer, but may also be a distributor or repackager.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
            <xs:element name="properties" type="bom:propertiesType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Provides the ability to document properties in a key/value store.
                        This provides flexibility to include data not officially supported in the standard
                        without having to use additional namespaces or create extensions.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="organizationalEntity">
        <xs:sequence minOccurs="0" maxOccurs="1">
            <xs:element name="name" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The name of the organization</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="url" type="xs:anyURI" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>The URL of the organization. Multiple URLs are allowed.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="contact" type="bom:organizationalContact" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>A contact person at the organization. Multiple contacts are allowed.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="toolType">
        <xs:annotation>
            <xs:documentation>Specifies a tool (manual or automated).</xs:documentation>
        </xs:annotation>
        <xs:sequence minOccurs="0" maxOccurs="1">
            <xs:element name="vendor" minOccurs="0" maxOccurs="1" type="xs:normalizedString">
                <xs:annotation>
                    <xs:documentation>The vendor of the tool used to create the BOM.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="name" minOccurs="0" maxOccurs="1" type="xs:normalizedString">
                <xs:annotation>
                    <xs:documentation>The name of the tool used to create the BOM.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="version" minOccurs="0" maxOccurs="1" type="xs:normalizedString">
                <xs:annotation>
                    <xs:documentation>The version of the tool used to create the BOM.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="hashes" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="hash" type="bom:hashType"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="organizationalContact">
        <xs:sequence minOccurs="0" maxOccurs="1">
            <xs:element name="name" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The name of the contact</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="email" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The email address of the contact.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="phone" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The phone number of the contact.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="componentsType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="component" type="bom:component"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="component">
        <xs:sequence>
            <xs:element name="supplier" type="bom:organizationalEntity" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The organization that supplied the component. The supplier may often
                        be the manufacturer, but may also be a distributor or repackager.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="author" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The person(s) or organization(s) that authored the component</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="publisher" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The person(s) or organization(s) that published the component</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="group" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The grouping name or identifier. This will often be a shortened, single
                        name of the company or project that produced the component, or the source package or
                        domain name. Whitespace and special characters should be avoided. Examples include:
                        apache, org.apache.commons, and apache.org.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="name" type="xs:normalizedString" minOccurs="1" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The name of the component. This will often be a shortened, single name
                        of the component. Examples: commons-lang3 and jquery</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="version" type="xs:normalizedString" minOccurs="1" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The component version. The version should ideally comply with semantic versioning
                        but is not enforced.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="description" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Specifies a description for the component</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="scope" type="bom:scope" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Specifies the scope of the component. If scope is not specified, 'runtime'
                        scope should be assumed by the consumer of the BOM</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="hashes" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="hash" type="bom:hashType"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
            <xs:element name="copyright" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>An optional copyright notice informing users of the underlying claims to
                        copyright ownership in a published work.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="cpe" type="bom:cpe" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        DEPRECATED - DO NOT USE. This will be removed in a future version.
                        Specifies a well-formed CPE name. See https://nvd.nist.gov/products/cpe
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="purl" type="xs:anyURI" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        Specifies the package-url (PURL). The purl, if specified, must be valid and conform
                        to the specification defined at: https://github.com/package-url/purl-spec
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="swid" type="bom:swidType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        Specifies metadata and content for ISO-IEC 19770-2 Software Identification (SWID) Tags.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="modified" type="xs:boolean" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        DEPRECATED - DO NOT USE. This will be removed in a future version. Use the pedigree
                        element instead to supply information on exactly how the component was modified.
                        A boolean value indicating is the component has been modified from the original.
                        A value of true indicates the component is a derivative of the original.
                        A value of false indicates the component has not been modified from the original.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="pedigree" type="bom:pedigreeType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        Component pedigree is a way to document complex supply chain scenarios where components are
                        created, distributed, modified, redistributed, combined with other components, etc.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="externalReferences" type="bom:externalReferences" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Provides the ability to document external references related to the
                        component or to the project the component describes.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="properties" type="bom:propertiesType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Provides the ability to document properties in a key/value store.
                        This provides flexibility to include data not officially supported in the standard
                        without having to use additional namespaces or create extensions.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="components" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        Specifies optional sub-components. This is not a dependency tree. It provides a way
                        to specify a hierarchical representation of component assemblies, similar to
                        system -> subsystem -> parts assembly in physical supply chains.
                    </xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="component" type="bom:component"/>
                        <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                            <xs:annotation>
                                <xs:documentation>
                                    Allows any undeclared elements as long as the elements are placed in a different namespace.
                                </xs:documentation>
                            </xs:annotation>
                        </xs:any>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="evidence" type="bom:componentEvidenceType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Provides the ability to document evidence collected through various forms of extraction or analysis.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:attribute name="type" type="bom:classification" use="required">
            <xs:annotation>
                <xs:documentation>
                    Specifies the type of component. For software components, classify as application if no more
                    specific appropriate classification is available or cannot be determined for the component.
                </xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="mime-type" type="bom:mimeType">
            <xs:annotation>
                <xs:documentation>
                    The optional mime-type of the component. When used on file components, the mime-type
                    can provide additional context about the kind of file being represented such as an image,
                    font, or executable. Some library or framework components may also have an associated mime-type.
                </xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="bom-ref" type="bom:refType">
            <xs:annotation>
                <xs:documentation>
                    An optional identifier which can be used to reference the component elsewhere in the BOM.
                    Uniqueness is enforced within all elements and children of the root-level bom element.
                </xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="licenseType">
        <xs:sequence>
            <xs:choice>
                <xs:element name="id" type="spdx:licenseId" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>A valid SPDX license ID</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="name" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>If SPDX does not define the license used, this field may be used to provide the license name</xs:documentation>
                    </xs:annotation>
                </xs:element>
            </xs:choice>
            <xs:element name="text" type="bom:attachedTextType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Specifies the optional full text of the attachment</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="url" type="xs:anyURI" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The URL to the attachment file. If the attachment is a license or BOM,
                        an externalReference should also be specified for completeness.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="attachedTextType">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:annotation>
                    <xs:documentation>Specifies attributes of the text</xs:documentation>
                </xs:annotation>
                <xs:attribute name="content-type" type="xs:normalizedString" default="text/plain">
                    <xs:annotation>
                        <xs:documentation>Specifies the content type of the text. Defaults to text/plain
                            if not specified.</xs:documentation>
                    </xs:annotation>
                </xs:attribute>
                <xs:attribute name="encoding" type="bom:encoding">
                    <xs:annotation>
                        <xs:documentation>
                            Specifies the optional encoding the text is represented in
                        </xs:documentation>
                    </xs:annotation>
                </xs:attribute>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="hashType">
        <xs:annotation>
            <xs:documentation>Specifies the file hash of the component</xs:documentation>
        </xs:annotation>
        <xs:simpleContent>
            <xs:extension base="bom:hashValue">
                <xs:attribute name="alg" type="bom:hashAlg" use="required">
                    <xs:annotation>
                        <xs:documentation>Specifies the algorithm used to create the hash</xs:documentation>
                    </xs:annotation>
                </xs:attribute>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:simpleType name="scope">
        <xs:restriction base="xs:string">
            <xs:enumeration value="required">
                <xs:annotation>
                    <xs:documentation>The component is required for runtime</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="optional">
                <xs:annotation>
                    <xs:documentation>The component is optional at runtime. Optional components are components that
                        are not capable of being called due to them not be installed or otherwise accessible by any means.
                        Components that are installed but due to configuration or other restrictions are prohibited from
                        being called must be scoped as 'required'.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="excluded">
                <xs:annotation>
                    <xs:documentation>Components that are excluded provide the ability to document component usage
                        for test and other non-runtime purposes. Excluded components are not reachable within a call
                        graph at runtime.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="classification">
        <xs:restriction base="xs:string">
            <xs:enumeration value="application">
                <xs:annotation>
                    <xs:documentation>A software application. Refer to https://en.wikipedia.org/wiki/Application_software
                        for information about applications.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="framework">
                <xs:annotation>
                    <xs:documentation>A software framework. Refer to https://en.wikipedia.org/wiki/Software_framework
                        for information on how frameworks vary slightly from libraries.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="library">
                <xs:annotation>
                    <xs:documentation>A software library. Refer to https://en.wikipedia.org/wiki/Library_(computing)
                        for information about libraries. All third-party and open source reusable components will likely
                        be a library. If the library also has key features of a framework, then it should be classified
                        as a framework. If not, or is unknown, then specifying library is recommended.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="container">
                <xs:annotation>
                    <xs:documentation>A packaging and/or runtime format, not specific to any particular technology,
                        which isolates software inside the container from software outside of a container through
                        virtualization technology. Refer to https://en.wikipedia.org/wiki/OS-level_virtualization</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="operating-system">
                <xs:annotation>
                    <xs:documentation>A software operating system without regard to deployment model
                        (i.e. installed on physical hardware, virtual machine, image, etc) Refer to
                        https://en.wikipedia.org/wiki/Operating_system</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="device">
                <xs:annotation>
                    <xs:documentation>A hardware device such as a processor, or chip-set. A hardware device
                        containing firmware should include a component for the physical hardware itself, and another
                        component of type 'firmware' or 'operating-system' (whichever is relevant), describing
                        information about the software running on the device.
                        See also the list of known device properties: https://github.com/CycloneDX/cyclonedx-property-taxonomy/blob/main/cdx/device.md
                    </xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="firmware">
                <xs:annotation>
                    <xs:documentation>A special type of software that provides low-level control over a devices
                        hardware. Refer to https://en.wikipedia.org/wiki/Firmware</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="file">
                <xs:annotation>
                    <xs:documentation>A computer file. Refer to https://en.wikipedia.org/wiki/Computer_file
                        for information about files.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="hashAlg">
        <xs:restriction base="xs:string">
            <xs:enumeration value="MD5"/>
            <xs:enumeration value="SHA-1"/>
            <xs:enumeration value="SHA-256"/>
            <xs:enumeration value="SHA-384"/>
            <xs:enumeration value="SHA-512"/>
            <xs:enumeration value="SHA3-256"/>
            <xs:enumeration value="SHA3-384"/>
            <xs:enumeration value="SHA3-512"/>
            <xs:enumeration value="BLAKE2b-256"/>
            <xs:enumeration value="BLAKE2b-384"/>
            <xs:enumeration value="BLAKE2b-512"/>
            <xs:enumeration value="BLAKE3"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="hashValue">
        <xs:restriction base="xs:token">
            <xs:pattern value="([a-fA-F0-9]{32})|([a-fA-F0-9]{40})|([a-fA-F0-9]{64})|([a-fA-F0-9]{96})|([a-fA-F0-9]{128})"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="mimeType">
        <xs:restriction base="xs:token">
            <xs:pattern value="[-+a-z0-9.]+/[-+a-z0-9.]+"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="encoding">
        <xs:restriction base="xs:string">
            <xs:enumeration value="base64"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="cpe">
        <xs:annotation>
            <xs:documentation xml:lang="en">
                Define the format for acceptable CPE URIs. Supports CPE 2.2 and CPE 2.3 formats.
                Refer to https://nvd.nist.gov/products/cpe for official specification.
            </xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern value="([c][pP][eE]:/[AHOaho]?(:[A-Za-z0-9\._\-~%]*){0,6})|(cpe:2\.3:[aho\*\-](:(((\?*|\*?)([a-zA-Z0-9\-\._]|(\\[\\\*\?!&quot;#$$%&amp;'\(\)\+,/:;&lt;=&gt;@\[\]\^`\{\|}~]))+(\?*|\*?))|[\*\-])){5}(:(([a-zA-Z]{2,3}(-([a-zA-Z]{2}|[0-9]{3}))?)|[\*\-]))(:(((\?*|\*?)([a-zA-Z0-9\-\._]|(\\[\\\*\?!&quot;#$$%&amp;'\(\)\+,/:;&lt;=&gt;@\[\]\^`\{\|}~]))+(\?*|\*?))|[\*\-])){4})"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="swidType">
        <xs:sequence>
            <xs:element name="text" type="bom:attachedTextType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Specifies the full content of the SWID tag.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="url" type="xs:anyURI" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The URL to the SWID file.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:attribute name="tagId" type="xs:string" use="required">
            <xs:annotation>
                <xs:documentation>Maps to the tagId of a SoftwareIdentity.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="name" type="xs:string" use="required">
            <xs:annotation>
                <xs:documentation>Maps to the name of a SoftwareIdentity.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="version" type="xs:string" use="optional" default="0.0">
            <xs:annotation>
                <xs:documentation>Maps to the version of a SoftwareIdentity.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="tagVersion" type="xs:integer" use="optional" default="0">
            <xs:annotation>
                <xs:documentation>Maps to the tagVersion of a SoftwareIdentity.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="patch" type="xs:boolean" use="optional" default="false">
            <xs:annotation>
                <xs:documentation>Maps to the patch of a SoftwareIdentity.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
    </xs:complexType>

    <xs:simpleType name="urnUuid">
        <xs:annotation>
            <xs:documentation xml:lang="en">
                Defines a string representation of a UUID conforming to RFC 4122.
            </xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern value="urn:uuid:([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})|(\{[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\})"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="externalReferenceType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="vcs">
                <xs:annotation>
                    <xs:documentation>Version Control System</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="issue-tracker">
                <xs:annotation>
                    <xs:documentation>Issue or defect tracking system, or an Application Lifecycle Management (ALM) system</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="website">
                <xs:annotation>
                    <xs:documentation>Website</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="advisories">
                <xs:annotation>
                    <xs:documentation>Security advisories</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="bom">
                <xs:annotation>
                    <xs:documentation>Bill-of-material document (CycloneDX, SPDX, SWID, etc)</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="mailing-list">
                <xs:annotation>
                    <xs:documentation>Mailing list or discussion group</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="social">
                <xs:annotation>
                    <xs:documentation>Social media account</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="chat">
                <xs:annotation>
                    <xs:documentation>Real-time chat platform</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="documentation">
                <xs:annotation>
                    <xs:documentation>Documentation, guides, or how-to instructions</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="support">
                <xs:annotation>
                    <xs:documentation>Community or commercial support</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="distribution">
                <xs:annotation>
                    <xs:documentation>Direct or repository download location</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="license">
                <xs:annotation>
                    <xs:documentation>The URL to the license file. If a license URL has been defined in the license
                        node, it should also be defined as an external reference for completeness</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="build-meta">
                <xs:annotation>
                    <xs:documentation>Build-system specific meta file (i.e. pom.xml, package.json, .nuspec, etc)</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="build-system">
                <xs:annotation>
                    <xs:documentation>URL to an automated build system</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="other">
                <xs:annotation>
                    <xs:documentation>Use this if no other types accurately describe the purpose of the external reference</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="externalReferences">
        <xs:annotation>
            <xs:documentation xml:lang="en">
                External references provide a way to document systems, sites, and information that may be relevant
                but which are not included with the BOM.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="reference" type="bom:externalReference">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Zero or more external references can be defined</xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="externalReference">
        <xs:sequence>
            <xs:element name="url" type="xs:anyURI" minOccurs="1" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The URL to the external reference</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="comment" type="xs:string" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">An optional comment describing the external reference</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="hashes" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="hash" type="bom:hashType"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="type" type="bom:externalReferenceType" use="required">
            <xs:annotation>
                <xs:documentation>Specifies the type of external reference. There are built-in types to describe common
                    references. If a type does not exist for the reference being referred to, use the "other" type.
                </xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="commitsType">
        <xs:annotation>
            <xs:documentation xml:lang="en">Zero or more commits can be specified.</xs:documentation>
        </xs:annotation>
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="commit" type="bom:commitType">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Specifies an individual commit.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="commitType">
        <xs:sequence>
            <xs:element name="uid" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">A unique identifier of the commit. This may be version control
                        specific. For example, Subversion uses revision numbers whereas git uses commit hashes.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="url" type="xs:anyURI" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The URL to the commit. This URL will typically point to a commit
                        in a version control system.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="author" type="bom:identifiableActionType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The author who created the changes in the commit</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="committer" type="bom:identifiableActionType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The person who committed or pushed the commit</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="message" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The text description of the contents of the commit</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="patchesType">
        <xs:annotation>
            <xs:documentation xml:lang="en">Zero or more patches can be specified.</xs:documentation>
        </xs:annotation>
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="patch" type="bom:patchType">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Specifies an individual patch.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="patchType">
        <xs:sequence>
            <xs:element name="diff" type="bom:diffType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The patch file (or diff) that show changes.
                        Refer to https://en.wikipedia.org/wiki/Diff</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="resolves" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="issue" type="bom:issueType"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:attribute name="type" type="bom:patchClassification" use="required">
            <xs:annotation>
                <xs:documentation>Specifies the purpose for the patch including the resolution of defects,
                    security issues, or new behavior or functionality</xs:documentation>
            </xs:annotation>
        </xs:attribute>
    </xs:complexType>

    <xs:simpleType name="patchClassification">
        <xs:restriction base="xs:string">
            <xs:enumeration value="unofficial">
                <xs:annotation>
                    <xs:documentation>A patch which is not developed by the creators or maintainers of the software
                        being patched. Refer to https://en.wikipedia.org/wiki/Unofficial_patch</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="monkey">
                <xs:annotation>
                    <xs:documentation>A patch which dynamically modifies runtime behavior.
                        Refer to https://en.wikipedia.org/wiki/Monkey_patch</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="backport">
                <xs:annotation>
                    <xs:documentation>A patch which takes code from a newer version of software and applies
                        it to older versions of the same software. Refer to https://en.wikipedia.org/wiki/Backporting</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="cherry-pick">
                <xs:annotation>
                    <xs:documentation>A patch created by selectively applying commits from other versions or
                        branches of the same software.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="issueClassification">
        <xs:restriction base="xs:string">
            <xs:enumeration value="defect">
                <xs:annotation>
                    <xs:documentation>A fault, flaw, or bug in software</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="enhancement">
                <xs:annotation>
                    <xs:documentation>A new feature or behavior in software</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="security">
                <xs:annotation>
                    <xs:documentation>A special type of defect which impacts security</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="diffType">
        <xs:sequence>
            <xs:element name="text" type="bom:attachedTextType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Specifies the optional text of the diff</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="url" type="xs:anyURI" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Specifies the URL to the diff</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="issueType">
        <xs:sequence>
            <xs:element name="id" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The identifier of the issue assigned by the source of the issue</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="name" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The name of the issue</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="description" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">A description of the issue</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="source" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:annotation>
                        <xs:documentation xml:lang="en">
                            The source of the issue where it is documented.
                        </xs:documentation>
                    </xs:annotation>
                    <xs:sequence>
                        <xs:element name="name" minOccurs="0" type="xs:normalizedString" maxOccurs="1">
                            <xs:annotation>
                                <xs:documentation xml:lang="en">
                                    The name of the source. For example "National Vulnerability Database",
                                    "NVD", and "Apache"
                                </xs:documentation>
                            </xs:annotation>
                        </xs:element>
                        <xs:element name="url" minOccurs="0" type="xs:anyURI" maxOccurs="1">
                            <xs:annotation>
                                <xs:documentation xml:lang="en">
                                    The url of the issue documentation as provided by the source
                                </xs:documentation>
                            </xs:annotation>
                        </xs:element>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="references" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="url" type="xs:anyURI"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:attribute name="type" type="bom:issueClassification" use="required">
            <xs:annotation>
                <xs:documentation>Specifies the type of issue</xs:documentation>
            </xs:annotation>
        </xs:attribute>
    </xs:complexType>

    <xs:complexType name="identifiableActionType">
        <xs:sequence>
            <xs:element name="timestamp" type="xs:dateTime" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The timestamp in which the action occurred</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="name" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The name of the individual who performed the action</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="email" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The email address of the individual who performed the action</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="pedigreeType">
        <xs:annotation>
            <xs:documentation xml:lang="en">
                Component pedigree is a way to document complex supply chain scenarios where components are created,
                distributed, modified, redistributed, combined with other components, etc. Pedigree supports viewing
                this complex chain from the beginning, the end, or anywhere in the middle. It also provides a way to
                document variants where the exact relation may not be known.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence>
            <xs:element name="ancestors" type="bom:componentsType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Describes zero or more components in which a component is derived
                        from. This is commonly used to describe forks from existing projects where the forked version
                        contains a ancestor node containing the original component it was forked from. For example,
                        Component A is the original component. Component B is the component being used and documented
                        in the BOM. However, Component B contains a pedigree node with a single ancestor documenting
                        Component A - the original component from which Component B is derived from.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="descendants" type="bom:componentsType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Descendants are the exact opposite of ancestors. This provides a
                        way to document all forks (and their forks) of an original or root component.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="variants" type="bom:componentsType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Variants describe relations where the relationship between the
                        components are not known. For example, if Component A contains nearly identical code to
                        Component B. They are both related, but it is unclear if one is derived from the other,
                        or if they share a common ancestor.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="commits" type="bom:commitsType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">A list of zero or more commits which provide a trail describing
                        how the component deviates from an ancestor, descendant, or variant.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="patches" type="bom:patchesType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">A list of zero or more patches describing how the component
                        deviates from an ancestor, descendant, or variant. Patches may be complimentary to commits
                        or may be used in place of commits.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="notes" type="xs:string" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Notes, observations, and other non-structured commentary
                        describing the components pedigree.
                    </xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="dependencyType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="dependency" type="bom:dependencyType"/>
        </xs:sequence>
        <xs:attribute name="ref" type="bom:refType" use="required">
            <xs:annotation>
                <xs:documentation>References a component or service by the its bom-ref attribute</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:anyAttribute namespace="##other" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="dependenciesType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="dependency" type="bom:dependencyType">
                <xs:annotation>
                    <xs:documentation>Components that do not have their own dependencies MUST be declared as empty
                        elements within the graph. Components that are not represented in the dependency graph MAY
                        have unknown dependencies. It is RECOMMENDED that implementations assume this to be opaque
                        and not an indicator of a component being dependency-free.</xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="servicesType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="service" type="bom:service"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="service">
        <xs:sequence>
            <xs:element name="provider" type="bom:organizationalEntity" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The organization that provides the service.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="group" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The grouping name, namespace, or identifier. This will often be a shortened,
                        single name of the company or project that produced the service or domain name.
                        Whitespace and special characters should be avoided.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="name" type="xs:normalizedString" minOccurs="1" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The name of the service. This will often be a shortened, single name
                        of the service.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="version" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>The service version.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="description" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Specifies a description for the service.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="endpoints" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="endpoint" type="xs:anyURI" minOccurs="1">
                            <xs:annotation>
                                <xs:documentation>A service endpoint URI.</xs:documentation>
                            </xs:annotation>
                        </xs:element>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="authenticated" type="xs:boolean" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>A boolean value indicating if the service requires authentication.
                        A value of true indicates the service requires authentication prior to use.
                        A value of false indicates the service does not require authentication.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="x-trust-boundary" type="xs:boolean" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>A boolean value indicating if use of the service crosses a trust zone or boundary.
                        A value of true indicates that by using the service, a trust boundary is crossed.
                        A value of false indicates that by using the service, a trust boundary is not crossed.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="data" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="classification" type="bom:dataClassificationType">
                            <xs:annotation>
                                <xs:documentation>Specifies the data classification.</xs:documentation>
                            </xs:annotation>
                        </xs:element>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
            <xs:element name="externalReferences" type="bom:externalReferences" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Provides the ability to document external references related to the service.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="properties" type="bom:propertiesType" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>Provides the ability to document properties in a key/value store.
                        This provides flexibility to include data not officially supported in the standard
                        without having to use additional namespaces or create extensions.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="services" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        Specifies optional sub-service. This is not a dependency tree. It provides a way
                        to specify a hierarchical representation of service assemblies, similar to
                        system -> subsystem -> parts assembly in physical supply chains.
                    </xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="service" type="bom:service"/>
                        <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                            <xs:annotation>
                                <xs:documentation>
                                    Allows any undeclared elements as long as the elements are placed in a different namespace.
                                </xs:documentation>
                            </xs:annotation>
                        </xs:any>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:attribute name="bom-ref" type="bom:refType">
            <xs:annotation>
                <xs:documentation>
                    An optional identifier which can be used to reference the service elsewhere in the BOM.
                    Uniqueness is enforced within all elements and children of the root-level bom element.
                </xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="dataClassificationType">
        <xs:annotation>
            <xs:documentation>Specifies the data classification.</xs:documentation>
        </xs:annotation>
        <xs:simpleContent>
            <xs:extension base="xs:normalizedString">
                <xs:attribute name="flow" type="bom:dataFlowType" use="required">
                    <xs:annotation>
                        <xs:documentation>Specifies the flow direction of the data.</xs:documentation>
                    </xs:annotation>
                </xs:attribute>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:simpleType name="dataFlowType">
        <xs:annotation>
            <xs:documentation>Specifies the flow direction of the data. Valid values are:
                inbound, outbound, bi-directional, and unknown. Direction is relative to the service.
                Inbound flow states that data enters the service. Outbound flow states that data
                leaves the service. Bi-directional states that data flows both ways, and unknown
                states that the direction is not known.</xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:enumeration value="inbound"/>
            <xs:enumeration value="outbound"/>
            <xs:enumeration value="bi-directional"/>
            <xs:enumeration value="unknown"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="licenseChoiceType">
        <xs:choice>
            <xs:element name="license" type="bom:licenseType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="expression" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>A valid SPDX license expression.
                        Refer to https://spdx.org/specifications for syntax requirements</xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:choice>
    </xs:complexType>

    <xs:complexType name="copyrightsType">
        <xs:sequence>
            <xs:element name="text" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="componentEvidenceType">
        <xs:sequence>
            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
            <xs:element name="copyright" type="bom:copyrightsType" minOccurs="0" maxOccurs="1"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="compositionsType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="composition" type="bom:compositionType"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="compositionType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="aggregate" type="bom:aggregateType" default="not_specified">
                <xs:annotation>
                    <xs:documentation>Specifies an aggregate type that describe how complete a relationship is.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="assemblies" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        The bom-ref identifiers of the components or services being described. Assemblies refer to
                        nested relationships whereby a constituent part may include other constituent parts. References
                        do not cascade to child parts. References are explicit for the specified constituent part only.
                    </xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="assembly" type="bom:bomReferenceType"/>
                        <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                            <xs:annotation>
                                <xs:documentation>
                                    Allows any undeclared elements as long as the elements are placed in a different namespace.
                                </xs:documentation>
                            </xs:annotation>
                        </xs:any>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
            <xs:element name="dependencies" minOccurs="0" maxOccurs="1">
                <xs:annotation>
                    <xs:documentation>
                        The bom-ref identifiers of the components or services being described. Dependencies refer to a
                        relationship whereby an independent constituent part requires another independent constituent
                        part. References do not cascade to transitive dependencies. References are explicit for the
                        specified dependency only.
                    </xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:sequence minOccurs="0" maxOccurs="unbounded">
                        <xs:element name="dependency" type="bom:bomReferenceType"/>
                        <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                            <xs:annotation>
                                <xs:documentation>
                                    Allows any undeclared elements as long as the elements are placed in a different namespace.
                                </xs:documentation>
                            </xs:annotation>
                        </xs:any>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:simpleType name="aggregateType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="complete">
                <xs:annotation>
                    <xs:documentation>The relationship is complete. No further relationships including constituent components, services, or dependencies exist.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="incomplete">
                <xs:annotation>
                    <xs:documentation>The relationship is incomplete. Additional relationships exist and may include constituent components, services, or dependencies.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="incomplete_first_party_only">
                <xs:annotation>
                    <xs:documentation>The relationship is incomplete. Only relationships for first-party components, services, or their dependencies are represented.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="incomplete_third_party_only">
                <xs:annotation>
                    <xs:documentation>The relationship is incomplete. Only relationships for third-party components, services, or their dependencies are represented.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="unknown">
                <xs:annotation>
                    <xs:documentation>The relationship may be complete or incomplete. This usually signifies a 'best-effort' to obtain constituent components, services, or dependencies but the completeness is inconclusive.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="not_specified">
                <xs:annotation>
                    <xs:documentation>The relationship completeness is not specified.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="bomReferenceType">
        <xs:attribute name="ref" type="bom:refType" use="required">
            <xs:annotation>
                <xs:documentation>References a component or service by the its bom-ref attribute</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:anyAttribute namespace="##other" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="propertiesType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="property" type="bom:propertyType"/>
            <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Allows any undeclared elements as long as the elements are placed in a different namespace.
                    </xs:documentation>
                </xs:annotation>
            </xs:any>
        </xs:sequence>
        <xs:anyAttribute namespace="##any" processContents="lax">
            <xs:annotation>
                <xs:documentation>User-defined attributes may be used on this element as long as they
                    do not have the same name as an existing attribute used by the schema.</xs:documentation>
            </xs:annotation>
        </xs:anyAttribute>
    </xs:complexType>

    <xs:complexType name="propertyType">
        <xs:annotation>
            <xs:documentation>Specifies an individual property with a name and value.</xs:documentation>
        </xs:annotation>
        <xs:simpleContent>
            <xs:extension base="xs:normalizedString">
                <xs:attribute name="name" type="xs:string" use="required">
                    <xs:annotation>
                        <xs:documentation>The name of the property. Duplicate names are allowed, each potentially having a different value.</xs:documentation>
                    </xs:annotation>
                </xs:attribute>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:element name="bom">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="metadata" type="bom:metadata" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Provides additional information about a BOM.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="components" type="bom:componentsType" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Provides the ability to document a list of components.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="services" type="bom:servicesType" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Provides the ability to document a list of external services.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="externalReferences" type="bom:externalReferences" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Provides the ability to document external references related to the BOM or
                            to the project the BOM describes.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="dependencies" type="bom:dependenciesType" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Provides the ability to document dependency relationships.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="compositions" type="bom:compositionsType" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Compositions describe constituent parts (including components, services, and dependency relationships) and their completeness.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="properties" type="bom:propertiesType" minOccurs="0" maxOccurs="1">
                    <xs:annotation>
                        <xs:documentation>Provides the ability to document properties in a name-value store.
                        This provides flexibility to include data not officially supported in the standard
                        without having to use additional namespaces or create extensions. Unlike key-value
                        stores, properties support duplicate names, each potentially having different values.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded">
                    <xs:annotation>
                        <xs:documentation>
                            Allows any undeclared elements as long as the elements are placed in a different namespace.
                        </xs:documentation>
                    </xs:annotation>
                </xs:any>
            </xs:sequence>
            <xs:attribute name="version" type="xs:integer" default="1">
                <xs:annotation>
                    <xs:documentation>The version allows component publishers/authors to make changes to existing
                        BOMs to update various aspects of the document such as description or licenses. When a system
                        is presented with multiple BOMs for the same component, the system should use the most recent
                        version of the BOM. The default version is '1' and should be incremented for each version of the
                        BOM that is published. Each version of a component should have a unique BOM and if no changes are
                        made to the BOMs, then each BOM will have a version of '1'.</xs:documentation>
                </xs:annotation>
            </xs:attribute>
            <xs:attribute name="serialNumber" type="bom:urnUuid">
                <xs:annotation>
                    <xs:documentation>Every BOM generated should have a unique serial number, even if the contents
                        of the BOM being generated have not changed over time. The process or tool responsible for
                        creating the BOM should create random UUID's for every BOM generated.</xs:documentation>
                </xs:annotation>
            </xs:attribute>
            <xs:anyAttribute namespace="##any" processContents="lax">
                <xs:annotation>
                    <xs:documentation>User-defined attributes may be used on this element as long as they
                        do not have the same name as an existing attribute used by the schema.</xs:documentation>
                </xs:annotation>
            </xs:anyAttribute>
        </xs:complexType>
        <xs:unique name="bom-ref">
            <xs:selector xpath=".//*"/>
            <xs:field xpath="@bom-ref"/>
        </xs:unique>
    </xs:element>
</xs:schema>
