<?xml version="1.0" encoding="UTF-8"?>
<!--
  Copyright (c) 2011 NLnet Labs
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  
  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
-->
<grammar xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <start>
    <element name="Adapter">
      <ref name="dns"/>
    </element>
  </start>
  <define name="dns">
    <element name="DNS">
      <zeroOrMore>
        <!-- TSIG secrets -->
        <ref name="tsig"/>
      </zeroOrMore>
      <optional>
        <!-- inbound zone transfer settings -->
        <element name="Inbound">
          <optional>
            <element name="RequestTransfer">
              <oneOrMore>
                <ref name="remote"/>
              </oneOrMore>
            </element>
          </optional>
          <optional>
            <element name="AllowNotify">
              <oneOrMore>
                <ref name="peer"/>
              </oneOrMore>
            </element>
          </optional>
        </element>
      </optional>
      <optional>
        <!-- outbound zone transfer settings -->
        <element name="Outbound">
          <optional>
            <element name="ProvideTransfer">
              <oneOrMore>
                <ref name="peer"/>
              </oneOrMore>
            </element>
          </optional>
          <optional>
            <element name="Notify">
              <oneOrMore>
                <ref name="remote"/>
              </oneOrMore>
            </element>
          </optional>
        </element>
      </optional>
    </element>
  </define>
  <!-- TSIG secret -->
  <define name="tsig">
    <element name="TSIG">
      <element name="Name">
        <data type="string"/>
      </element>
      <!-- http://www.iana.org/assignments/tsig-algorithm-names -->
      <element name="Algorithm">
        <data type="string"/>
      </element>
      <!-- base64 encoded secret -->
      <element name="Secret">
        <data type="base64Binary"/>
      </element>
    </element>
  </define>
  <define name="remote">
    <element name="Remote">
      <ref name="address"/>
      <optional>
        <ref name="port"/>
      </optional>
      <optional>
        <ref name="key"/>
      </optional>
    </element>
  </define>
  <define name="peer">
    <element name="Peer">
      <optional>
        <ref name="prefix"/>
      </optional>
      <optional>
        <ref name="key"/>
      </optional>
    </element>
  </define>
  <define name="address">
    <element name="Address">
      <data type="string"/>
    </element>
  </define>
  <!-- e.g., 192.0.2.1 or 2001:DB8::1 -->
  <define name="prefix">
    <element name="Prefix">
      <data type="string"/>
    </element>
  </define>
  <!-- e.g., 192.0.2.0/24 or 2001:DB8::/32 -->
  <define name="port">
    <element name="Port">
      <data type="positiveInteger">
        <param name="maxInclusive">65535</param>
      </data>
    </element>
  </define>
  <define name="key">
    <element name="Key">
      <data type="string"/>
    </element>
  </define>
</grammar>
