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<?xml version="1.0" encoding="UTF-8"?>
<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"
version="1.0.0 2010-01-22">
<!--
filter is an OGC Standard.
Copyright (c) 2002,2010 Open Geospatial Consortium, Inc. All Rights Reserved.
To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .
-->
<xsd:element name="Add"
type="ogc:BinaryOperatorType"
substitutionGroup="ogc:expression"/>
<xsd:element name="Sub"
type="ogc:BinaryOperatorType"
substitutionGroup="ogc:expression"/>
<xsd:element name="Mul"
type="ogc:BinaryOperatorType"
substitutionGroup="ogc:expression"/>
<xsd:element name="Div"
type="ogc:BinaryOperatorType"
substitutionGroup="ogc:expression"/>
<xsd:element name="PropertyName"
type="ogc:PropertyNameType"
substitutionGroup="ogc:expression"/>
<xsd:element name="Function"
type="ogc:FunctionType"
substitutionGroup="ogc:expression"/>
<xsd:element name="Literal"
type="ogc:LiteralType"
substitutionGroup="ogc:expression"/>
<xsd:element name="expression" type="ogc:ExpressionType" abstract="true"/>
<xsd:complexType name="ExpressionType" abstract="true"/>
<xsd:complexType name="BinaryOperatorType">
<xsd:complexContent>
<xsd:extension base="ogc:ExpressionType">
<xsd:sequence>
<xsd:element ref="ogc:expression" minOccurs="2" maxOccurs="2"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="FunctionType">
<xsd:complexContent>
<xsd:extension base="ogc:ExpressionType">
<xsd:sequence>
<xsd:element ref="ogc:expression"
minOccurs="0" maxOccurs="unbounded"/>
</xsd:sequence>
<xsd:attribute name="name" type="xsd:string" use="required"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="LiteralType">
<xsd:complexContent mixed="true">
<xsd:extension base="ogc:ExpressionType">
<xsd:sequence>
<xsd:any minOccurs="0"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="PropertyNameType">
<xsd:complexContent mixed="true">
<xsd:extension base="ogc:ExpressionType"/>
</xsd:complexContent>
</xsd:complexType>
</xsd:schema>
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