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Reinstate queryCapability.0.4.xsd. It is still used in the radar server (QueryCapability code) and XMLEntityResolver.
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‎cdm/core/src/main/resources/resources/thredds/schemas/queryCapability.0.4.xsd‎

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<?xml version="1.0" encoding="UTF-8"?>
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<xsd:schema targetNamespace="http://www.unidata.ucar.edu/namespaces/thredds/queryCapability/v0.4"
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xmlns="http://www.unidata.ucar.edu/namespaces/thredds/queryCapability/v0.4"
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xmlns:xsd="http://www.w3.org/2001/XMLSchema"
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xmlns:cat="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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elementFormDefault="qualified">
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<xsd:import namespace="http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0"
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schemaLocation="https://schemas.unidata.ucar.edu/thredds/InvCatalog.1.0.xsd" />
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<!--
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The queryCapability element.
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-->
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<xsd:element name="queryCapability">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element ref="query"/>
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<!-- Require a selectService, more allowed because of selector elements. -->
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<xsd:element ref="selectService"/>
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<xsd:element ref="selector" minOccurs="1" maxOccurs="unbounded"/>
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<xsd:element ref="userInterface" minOccurs="0" maxOccurs="unbounded"/>
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</xsd:sequence>
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<xsd:attribute name="version" type="xsd:token" default="0.4"/>
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<xsd:attribute name="name" type="xsd:token"/>
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</xsd:complexType>
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<!-- The id attribute of the selector element must be unique. -->
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<xsd:unique name="selectorID">
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<xsd:selector xpath=".//selector"/>
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<xsd:field xpath="@id"/>
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</xsd:unique>
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</xsd:element>
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<!--
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The query element.
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-->
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<xsd:element name="query">
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<xsd:complexType>
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<xsd:attribute name="base" type="xsd:string" use="required"/>
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</xsd:complexType>
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</xsd:element>
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<!--
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An abstract base class for all selector elements.
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-->
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<xsd:element name="selector" type="selectorType" abstract="true"/>
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<xsd:complexType name="selectorType">
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<xsd:sequence>
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<xsd:element name="description" type="cat:documentationType" minOccurs="0" maxOccurs="1"/>
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</xsd:sequence>
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<xsd:attribute name="id" type="xsd:token" use="required"/>
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<xsd:attribute name="title" type="xsd:token" use="required"/>
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<xsd:attribute name="template" type="xsd:token"/>
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<xsd:attribute name="required" type="xsd:boolean" default="true"/>
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</xsd:complexType>
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<!--
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compound selectors.
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-->
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<xsd:element name="compound" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:sequence>
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<xsd:element ref="selector"/>
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<xsd:element name="or"/>
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<xsd:element ref="selector"/>
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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:element>
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<xsd:simpleType name="operator">
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<xsd:union memberTypes="xsd:token">
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<xsd:simpleType>
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<xsd:restriction base="xsd:token">
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<xsd:enumeration value="and"/>
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<xsd:enumeration value="or"/>
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</xsd:restriction>
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</xsd:simpleType>
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</xsd:union>
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</xsd:simpleType>
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<!--
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The selectList element defines a list of choices from which a user can
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select one or more entries.
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-->
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<!-- When the construct method is set to "template", the
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template string must contain exactly one replacement string.
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The template string does not have to be related to the id
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of the selector, if one is given. No matter the actual
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replacement string used, it will be replaced with the value
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of the selection. When the "paramValue" construct method
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is chosen, the parameter name will be the value of the id
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or "item" if no id is given, i.e., "<id>=<value>" or
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"item=<value>".
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-->
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<xsd:element name="selectList" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:sequence>
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<xsd:element ref="choice" minOccurs="1" maxOccurs="unbounded"/>
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</xsd:sequence>
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<xsd:attribute name="multiple" type="xsd:boolean" default="false"/>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="choice" type="choiceType"/>
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<xsd:complexType name="choiceType">
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<xsd:sequence>
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<xsd:element name="description" type="cat:documentationType" minOccurs="0" maxOccurs="1"/>
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<xsd:element ref="selectList" 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:attribute name="value" type="xsd:string" use="required"/>
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</xsd:complexType>
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<!--
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A selectService element defines the list of serviceTypes available through
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a query. The user can select the service type(s) they understand and limit the
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datasets returned to only those service types..
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-->
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<xsd:element name="selectService" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:sequence>
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<xsd:element name="serviceType" minOccurs="1" maxOccurs="unbounded">
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<xsd:complexType>
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<xsd:simpleContent>
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<xsd:extension base="cat:serviceTypes">
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<xsd:attribute name="title" type="xsd:token"/>
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<xsd:attribute name="dataFormatType" type="cat:dataFormatTypes"/>
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<xsd:attribute name="returns" type="xsd:token" use="required"/>
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<xsd:attribute name="value" type="xsd:token" use="required"/>
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</xsd:extension>
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</xsd:simpleContent>
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</xsd:complexType>
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</xsd:element>
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</xsd:sequence>
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<xsd:attribute name="multiple" type="xsd:boolean" default="false"/>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:element>
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<!--
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A selectStation element defines a list of stations from which a user can select.
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-->
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<!-- When the construct method is set to "template", the
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template string must contain exactly one replacement string.
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The template string does not have to be related to the id
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of the selector, if one is given. No matter the actual
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replacement string used, it will be replaced with the value
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of the selection. When the "paramValue" construct method
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is chosen, the parameter name will be the value of the id
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or "stn" if no id is given, i.e., "<id>=<value>" or
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"stn=<value>".
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-->
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<xsd:element name="selectStation" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:sequence>
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<xsd:element ref="station" minOccurs="1" maxOccurs="unbounded"/>
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</xsd:sequence>
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<xsd:attribute name="multiple" type="xsd:boolean" default="false"/>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="station" substitutionGroup="choice">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="choiceType">
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<xsd:sequence>
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<xsd:element ref="location"/>
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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:element>
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<xsd:element name="location" type="locationType"/>
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<xsd:complexType name="locationType">
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<xsd:attribute name="latitude" type="xsd:float" use="required"/>
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<xsd:attribute name="longitude" type="xsd:float" use="required"/>
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<xsd:attribute name="latitude_units" type="xsd:token" default="degrees_north"/>
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<xsd:attribute name="longitude_units" type="xsd:token" default="degrees_east"/>
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</xsd:complexType>
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<xsd:element name="location3D" substitutionGroup="location">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="locationType">
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<xsd:attribute name="elevation" type="xsd:float" use="required"/>
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<xsd:attribute name="elevation_units" type="xsd:token" default="msl"/>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:element>
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<!--
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A selectFromRange element defines a range from which a user may select
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a point or a range.
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To select a point, a single replacement string is required: {point}. To
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select a range, two replacement strings are required: {min} and {max}.
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-->
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<xsd:element name="selectFromRange" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:attribute name="min" type="xsd:decimal" use="required"/>
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<xsd:attribute name="max" type="xsd:decimal" use="required"/>
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<xsd:attribute name="units" type="xsd:string"/>
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<xsd:attribute name="modulo" type="xsd:boolean" default="false"/>
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<xsd:attribute name="resolution" type="xsd:float" use="required"/>
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<xsd:attribute name="selectType" type="rangeSelectTypeEnum" default="subrange" />
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:element>
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<!-- Enumeration of allowed types of selections from a range. -->
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<xsd:simpleType name="rangeSelectTypeEnum">
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<xsd:restriction base="xsd:token">
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<xsd:enumeration value="point"/>
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<xsd:enumeration value="subrange"/>
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<!--xsd:enumeration value="pointOrRange"/-->
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</xsd:restriction>
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</xsd:simpleType>
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<!--
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A selectFromDateRange element defines a date range from which a user may
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select a point or a date range.
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To select a point, a single replacement string is required: {point}. To
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select a range, two replacement strings are required: {min} and {max}.
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-->
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<xsd:element name="selectFromDateRange" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:attribute name="start" type="cat:dateType"/>
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<xsd:attribute name="end" type="cat:dateType"/>
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<xsd:attribute name="duration" type="cat:duration"/>
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<xsd:attribute name="resolution" type="cat:duration" use="required"/>
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<xsd:attribute name="selectType" type="rangeSelectTypeEnum" default="subrange"/>
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</xsd:extension>
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</xsd:complexContent>
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</xsd:complexType>
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</xsd:element>
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<!--
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The selectFromGeoRegion element defines a geographic region from which the
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user can select a geographic region, currently limited to a bounding box.
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-->
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<xsd:element name="selectFromGeoRegion" substitutionGroup="selector">
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<xsd:complexType>
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<xsd:complexContent>
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<xsd:extension base="selectorType">
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<xsd:sequence>
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<xsd:element ref="geoBoundingBox"/>
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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:element>
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<xsd:element name="geoBoundingBox">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="lowerLeft" type="locationType"/>
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<xsd:element name="upperRight" type="locationType"/>
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</xsd:sequence>
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</xsd:complexType>
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</xsd:element>
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<!--
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The userInterface element definition.
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-->
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<xsd:element name="userInterface">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:any minOccurs="0" maxOccurs="unbounded" processContents="skip"/>
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</xsd:sequence>
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</xsd:complexType>
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</xsd:element>
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</xsd:schema>

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