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<?xml version="1.0" encoding="UTF-8"?>
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<xsd:schema
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targetNamespace="http://www.opengis.net/ogc"
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xmlns:ogc="http://www.opengis.net/ogc"
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xmlns:gml="http://www.opengis.net/gml"
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xmlns:xsd="http://www.w3.org/2001/XMLSchema"
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elementFormDefault="qualified">
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<xsd:element name="Add"
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type="ogc:BinaryOperatorType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="Sub"
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type="ogc:BinaryOperatorType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="Mul"
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type="ogc:BinaryOperatorType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="Div"
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type="ogc:BinaryOperatorType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="PropertyName"
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type="ogc:PropertyNameType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="Function"
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type="ogc:FunctionType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="Literal"
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type="ogc:LiteralType"
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substitutionGroup="ogc:expression"/>
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<xsd:element name="expression" type="ogc:ExpressionType" abstract="true"/>
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<xsd:complexType name="ExpressionType" abstract="true"/>
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<xsd:complexType name="BinaryOperatorType">
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<xsd:complexContent>
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<xsd:extension base="ogc:ExpressionType">
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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="FunctionType">
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<xsd:complexContent>
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<xsd:extension base="ogc:ExpressionType">
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<xsd:sequence>
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<xsd:element ref="ogc:expression"
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minOccurs="0" maxOccurs="unbounded"/>
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</xsd:sequence>
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<xsd:attribute name="name" 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="LiteralType">
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<xsd:complexContent mixed="true">
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<xsd:extension base="ogc:ExpressionType">
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<xsd:sequence>
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<xsd:any minOccurs="0"/>
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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="PropertyNameType">
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<xsd:complexContent mixed="true">
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<xsd:extension base="ogc:ExpressionType"/>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:schema>
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