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