<?xml version="1.0" encoding="UTF-8"?>
<!-- File: xlinks.xsd  -->
<schema xmlns:xlink="http://www.w3.org/1999/xlink" targetNamespace="http://www.w3.org/1999/xlink"
        xmlns="http://www.w3.org/2001/XMLSchema"
        version="2.0">
  <annotation>
    <appinfo source="urn:opengis:specification:gml:schema-xlinks:v3.0c2">xlinks.xsd v3.0b2 2001-07
    </appinfo>
    <documentation>
      GML 3.0 candidate xlinks schema. Copyright (c) 2001 OGC, All Rights Reserved.
    </documentation>
  </annotation>
  <!-- ==============================================================
       global declarations
      =============================================================== -->
  <!-- locator attribute -->
  <attribute name="href" type="anyURI"/>
  <!-- semantic attributes -->
  <attribute name="role" type="anyURI"/>
  <attribute name="arcrole" type="anyURI"/>
  <attribute name="title" type="string"/>
  <!-- behavior attributes -->
  <attribute name="show">
    <annotation>
      <documentation>
        The 'show' attribute is used to communicate the desired presentation
        of the ending resource on traversal from the starting resource; it's
        value should be treated as follows:
        new - load ending resource in a new window, frame, pane, or other
        presentation context
        replace - load the resource in the same window, frame, pane, or
        other presentation context
        embed - load ending resource in place of the presentation of the
        starting resource
        other - behavior is unconstrained; examine other markup in the
        link for hints
        none - behavior is unconstrained
      </documentation>
    </annotation>
    <simpleType>
      <restriction base="string">
        <enumeration value="new"/>
        <enumeration value="replace"/>
        <enumeration value="embed"/>
        <enumeration value="other"/>
        <enumeration value="none"/>
      </restriction>
    </simpleType>
  </attribute>
  <attribute name="actuate">
    <annotation>
      <documentation>
        The 'actuate' attribute is used to communicate the desired timing
        of traversal from the starting resource to the ending resource;
        it's value should be treated as follows:
        onLoad - traverse to the ending resource immediately on loading
        the starting resource
        onRequest - traverse from the starting resource to the ending
        resource only on a post-loading event triggered for
        this purpose
        other - behavior is unconstrained; examine other markup in link
        for hints
        none - behavior is unconstrained
      </documentation>
    </annotation>
    <simpleType>
      <restriction base="string">
        <enumeration value="onLoad"/>
        <enumeration value="onRequest"/>
        <enumeration value="other"/>
        <enumeration value="none"/>
      </restriction>
    </simpleType>
  </attribute>
  <!-- traversal attributes -->
  <attribute name="label" type="string"/>
  <attribute name="from" type="string"/>
  <attribute name="to" type="string"/>
  <!-- ==============================================================
       Attributes grouped by XLink type, as specified in the W3C
       Proposed Recommendation (dated 2000-12-20)
    ============================================================== -->
  <attributeGroup name="simpleLink">
    <attribute name="type" type="string" fixed="simple" form="qualified"/>
    <attribute ref="xlink:href" use="optional"/>
    <attribute ref="xlink:role" use="optional"/>
    <attribute ref="xlink:arcrole" use="optional"/>
    <attribute ref="xlink:title" use="optional"/>
    <attribute ref="xlink:show" use="optional"/>
    <attribute ref="xlink:actuate" use="optional"/>
  </attributeGroup>
  <attributeGroup name="extendedLink">
    <attribute name="type" type="string" fixed="extended" form="qualified"/>
    <attribute ref="xlink:role" use="optional"/>
    <attribute ref="xlink:title" use="optional"/>
  </attributeGroup>
  <attributeGroup name="locatorLink">
    <attribute name="type" type="string" fixed="locator" form="qualified"/>
    <attribute ref="xlink:href" use="required"/>
    <attribute ref="xlink:role" use="optional"/>
    <attribute ref="xlink:title" use="optional"/>
    <attribute ref="xlink:label" use="optional"/>
  </attributeGroup>
  <attributeGroup name="arcLink">
    <attribute name="type" type="string" fixed="arc" form="qualified"/>
    <attribute ref="xlink:arcrole" use="optional"/>
    <attribute ref="xlink:title" use="optional"/>
    <attribute ref="xlink:show" use="optional"/>
    <attribute ref="xlink:actuate" use="optional"/>
    <attribute ref="xlink:from" use="optional"/>
    <attribute ref="xlink:to" use="optional"/>
  </attributeGroup>
  <attributeGroup name="resourceLink">
    <attribute name="type" type="string" fixed="resource" form="qualified"/>
    <attribute ref="xlink:role" use="optional"/>
    <attribute ref="xlink:title" use="optional"/>
    <attribute ref="xlink:label" use="optional"/>
  </attributeGroup>
  <attributeGroup name="titleLink">
    <attribute name="type" type="string" fixed="title" form="qualified"/>
  </attributeGroup>
  <attributeGroup name="emptyLink">
    <attribute name="type" type="string" fixed="none" form="qualified"/>
  </attributeGroup>
</schema>
