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<?xml version="1.0" encoding="UTF-8"?>
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<xsd:schema targetNamespace="http://www.opengis.net/ogc" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
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<xsd:include schemaLocation="expr.xsd"/>
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<xsd:import namespace="http://www.opengis.net/gml" schemaLocation="../../gml/2.1.2/geometry.xsd"/>
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<!-- ============================================= -->
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<!-- FILTER EXPRESSION -->
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<!-- ============================================= -->
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<xsd:element name="FeatureId" type="ogc:FeatureIdType"/>
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<xsd:element name="Filter" type="ogc:FilterType"/>
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<!-- ============================================= -->
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<!-- COMPARISON OPERATORS -->
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<!-- ============================================= -->
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<xsd:element name="comparisonOps" type="ogc:ComparisonOpsType" abstract="true"/>
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<xsd:element name="PropertyIsEqualTo" type="ogc:BinaryComparisonOpType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsNotEqualTo" type="ogc:BinaryComparisonOpType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsLessThan" type="ogc:BinaryComparisonOpType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsGreaterThan" type="ogc:BinaryComparisonOpType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsLessThanOrEqualTo" type="ogc:BinaryComparisonOpType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsGreaterThanOrEqualTo" type="ogc:BinaryComparisonOpType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsLike" type="ogc:PropertyIsLikeType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsNull" type="ogc:PropertyIsNullType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:element name="PropertyIsBetween" type="ogc:PropertyIsBetweenType" substitutionGroup="ogc:comparisonOps"/>
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<xsd:complexType name="ComparisonOpsType" abstract="true"/>
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<!-- ============================================= -->
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<!-- SPATIAL OPERATORS (sec 3.2.19.2 99-049) -->
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<!-- ============================================= -->
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<xsd:element name="spatialOps" type="ogc:SpatialOpsType" abstract="true"/>
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<xsd:element name="Equals" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Disjoint" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Touches" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Within" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Overlaps" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Crosses" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Intersects" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Contains" type="ogc:BinarySpatialOpType" substitutionGroup="ogc:spatialOps"/>
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<!-- These operatons are from sec 4.2 of OpenGIS Catalog Interface -->
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<xsd:element name="DWithin" type="ogc:DistanceBufferType" substitutionGroup="ogc:spatialOps"/>
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<xsd:element name="Beyond" type="ogc:DistanceBufferType" substitutionGroup="ogc:spatialOps"/>
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<!-- This is a convenience operator to allow simple BBOX queries -->
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<xsd:element name="BBOX" type="ogc:BBOXType" substitutionGroup="ogc:spatialOps"/>
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<xsd:complexType name="SpatialOpsType" abstract="true"/>
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<!-- ============================================= -->
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<!-- LOGICAL OPERATORS -->
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<!-- ============================================= -->
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<xsd:element name="logicOps" type="ogc:LogicOpsType" abstract="true"/>
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<xsd:element name="And" type="ogc:BinaryLogicOpType" substitutionGroup="ogc:logicOps"/>
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<xsd:element name="Or" type="ogc:BinaryLogicOpType" substitutionGroup="ogc:logicOps"/>
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<xsd:element name="Not" type="ogc:UnaryLogicOpType" substitutionGroup="ogc:logicOps"/>
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<xsd:complexType name="LogicOpsType" abstract="true"/>
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<!-- ============================================= -->
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<!-- COMPLEX TYPES -->
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<!-- ============================================= -->
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<xsd:complexType name="FilterType">
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<xsd:choice>
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<xsd:element ref="ogc:spatialOps"/>
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<xsd:element ref="ogc:comparisonOps"/>
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<xsd:element ref="ogc:logicOps"/>
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<xsd:element ref="ogc:FeatureId" maxOccurs="unbounded"/>
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</xsd:choice>
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</xsd:complexType>
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<xsd:complexType name="FeatureIdType">
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<xsd:attribute name="fid" type="xsd:anyURI" use="required"/>
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</xsd:complexType>
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<xsd:complexType name="BinaryComparisonOpType">
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<xsd:complexContent>
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<xsd:extension base="ogc:ComparisonOpsType">
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<xsd:sequence>
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<xsd:element ref="ogc:expression" minOccurs="2" maxOccurs="2"/>
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</xsd:sequence>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="PropertyIsLikeType">
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<xsd:complexContent>
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<xsd:extension base="ogc:ComparisonOpsType">
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<xsd:sequence>
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<xsd:element ref="ogc:PropertyName"/>
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<xsd:element ref="ogc:Literal"/>
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</xsd:sequence>
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<xsd:attribute name="wildCard" type="xsd:string" use="required"/>
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<xsd:attribute name="singleChar" type="xsd:string" use="required"/>
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<xsd:attribute name="escape" type="xsd:string" use="required"/>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="PropertyIsNullType">
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<xsd:complexContent>
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<xsd:extension base="ogc:ComparisonOpsType">
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<xsd:choice>
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<xsd:element ref="ogc:PropertyName"/>
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<xsd:element ref="ogc:Literal"/>
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</xsd:choice>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="PropertyIsBetweenType">
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<xsd:complexContent>
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<xsd:extension base="ogc:ComparisonOpsType">
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<xsd:sequence>
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<xsd:element ref="ogc:expression"/>
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<xsd:element name="LowerBoundary" type="ogc:LowerBoundaryType"/>
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<xsd:element name="UpperBoundary" type="ogc:UpperBoundaryType"/>
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</xsd:sequence>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="LowerBoundaryType">
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<xsd:choice>
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<xsd:element ref="ogc:expression"/>
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</xsd:choice>
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</xsd:complexType>
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<xsd:complexType name="UpperBoundaryType">
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<xsd:sequence>
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<xsd:element ref="ogc:expression"/>
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</xsd:sequence>
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</xsd:complexType>
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<xsd:complexType name="BinarySpatialOpType">
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<xsd:complexContent>
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<xsd:extension base="ogc:SpatialOpsType">
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<xsd:sequence>
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<xsd:element ref="ogc:PropertyName"/>
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<xsd:choice>
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<xsd:element ref="gml:_Geometry"/>
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<xsd:element ref="gml:Box"/>
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</xsd:choice>
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</xsd:sequence>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="BBOXType">
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<xsd:complexContent>
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<xsd:extension base="ogc:SpatialOpsType">
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<xsd:sequence>
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<xsd:element ref="ogc:PropertyName"/>
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<xsd:element ref="gml:Box"/>
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</xsd:sequence>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="DistanceBufferType">
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<xsd:complexContent>
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<xsd:extension base="ogc:SpatialOpsType">
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<xsd:sequence>
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<xsd:element ref="ogc:PropertyName"/>
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<xsd:element ref="gml:_Geometry"/>
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<xsd:element name="Distance" type="ogc:DistanceType"/>
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</xsd:sequence>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="DistanceType" mixed="true">
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<xsd:attribute name="units" type="xsd:string" use="required"/>
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</xsd:complexType>
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<xsd:complexType name="BinaryLogicOpType">
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<xsd:complexContent>
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<xsd:extension base="ogc:LogicOpsType">
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<xsd:choice minOccurs="2" maxOccurs="unbounded">
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<xsd:element ref="ogc:comparisonOps"/>
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<xsd:element ref="ogc:spatialOps"/>
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<xsd:element ref="ogc:logicOps"/>
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</xsd:choice>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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<xsd:complexType name="UnaryLogicOpType">
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<xsd:complexContent>
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<xsd:extension base="ogc:LogicOpsType">
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<xsd:sequence>
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<xsd:choice>
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<xsd:element ref="ogc:comparisonOps"/>
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<xsd:element ref="ogc:spatialOps"/>
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<xsd:element ref="ogc:logicOps"/>
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</xsd:choice>
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</xsd:sequence>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:schema>
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