xml/schema/projects/he_ipv6.xsd

<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema targetNamespace="https://tunnelbroker.net/"
           xmlns="https://tunnelbroker.net/"
           xmlns:heIPv6="https://tunnelbroker.net/"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified"
           attributeFormDefault="unqualified">

  <xs:include schemaLocation="../lib/elements/he_ipv6.xsd"/>

  <!-- ROOT -->
  <xs:element name="heIPv6">
    <xs:complexType>
      <xs:all>
        <xs:element name="creds" minOccurs="1">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="cred" type="e_he_ipv6_cred" minOccurs="1" maxOccurs="unbounded"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element name="tunnels" minOccurs="1">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="tunnel" minOccurs="1" maxOccurs="unbounded" type="e_he_ipv6_tunnel">
              </xs:element>
            </xs:sequence>
          </xs:complexType>
          <xs:unique name="uniq_tun">
            <xs:selector xpath="heIPv6:tunnel"/>
            <xs:field xpath="@id"/>
          </xs:unique>
        </xs:element>
      </xs:all>
    </xs:complexType>
    <!--
    I have tried and tried to do document-wide unique constraints of alloc addrs and client addrs etc., but to no avail.
    I keep getting e.g.:
      Element '{http://www.w3.org/2001/XMLSchema}selector', attribute 'xpath': The XPath expression
      '//heIPv6:alloc' could not be compiled.
    So it's not idiot-proof.
    -->
  </xs:element>

</xs:schema>