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<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<xs:schema targetNamespace="http://www.w3.org/2005/Atom"
xmlns="http://www.w3.org/2005/Atom" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="xml.xsd" />
<xs:import namespace="http://www.w3.org/1999/xhtml" schemaLocation="xhtml1.xsd" />
<xs:element name="feed" type="feedType"/>
<xs:element name="entry" type="entryType"/>
<xs:complexType name="feedType">
<xs:complexContent>
<xs:extension base="sourceType">
<xs:sequence>
<xs:element name="entry" type="entryType" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:attributeGroup ref="commonAttributes" />
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="entryType">
<xs:choice maxOccurs="unbounded">
<xs:element name="author" type="personConstruct" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="category" type="categoryType" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="content" type="contentType" minOccurs="0" />
<xs:element name="contributor" type="personConstruct" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="id" type="idType" />
<xs:element name="link" type="linkType" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="published" type="dateConstruct" minOccurs="0" />
<xs:element name="rights" type="textConstruct" minOccurs="0" />
<xs:element name="source" type="sourceType" minOccurs="0" />
<xs:element name="summary" type="textConstruct" maxOccurs="0" />
<xs:element name="title" type="textConstruct" />
<xs:element name="updated" type="dateConstruct" />
<xs:element name="extension" type="extensionType" minOccurs="0" maxOccurs="unbounded" />
</xs:choice>
<xs:attributeGroup ref="commonAttributes"/>
</xs:complexType>
<xs:complexType name="sourceType">
<xs:choice maxOccurs="unbounded">
<xs:element name="author" type="personConstruct" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="category" type="categoryType" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="contributor" type="personConstruct" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="generator" type="generatorType" minOccurs="0" />
<xs:element name="icon" type="iconType" minOccurs="0" />
<xs:element name="id" type="idType" />
<xs:element name="link" type="linkType" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="logo" type="logoType" minOccurs="0" />
<xs:element name="rights" type="textConstruct" minOccurs="0" />
<xs:element name="subtitle" type="textConstruct" minOccurs="0" />
<xs:element name="title" type="textConstruct" />
<xs:element name="updated" type="dateConstruct" />
<xs:element name="extension" type="extensionType" minOccurs="0" maxOccurs="unbounded" />
</xs:choice>
</xs:complexType>
<xs:complexType name="personConstruct">
<xs:choice maxOccurs="unbounded">
<xs:element name="name" type="xs:string" />
<xs:element name="uri" type="uriType" minOccurs="0" />
<xs:element name="email" type="emailType" minOccurs="0" />
<xs:element name="extension" type="extensionType" minOccurs="0" maxOccurs="unbounded" />
</xs:choice>
</xs:complexType>
<xs:complexType name="categoryType">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="term" type="xs:string" use="required" />
<xs:attribute name="scheme" type="uriType" />
<xs:attribute name="label" type="xs:string" />
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
<!-- TODO: undefinedContent - beyond string? -->
</xs:complexType>
<xs:complexType name="generatorType">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="uri" type="uriType" />
<xs:attribute name="version" type="xs:string" />
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="iconType">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="idType">
<xs:simpleContent>
<xs:extension base="uriType">
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="logoType">
<xs:simpleContent>
<xs:extension base="uriType">
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="contentType" mixed="true">
<xs:sequence>
<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:attribute name="type" type="xs:string" />
<xs:attribute name="src" type="uriType" minOccurs="0" />
<xs:attributeGroup ref="commonAttributes"/>
</xs:complexType>
<xs:complexType name="linkType">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="href" type="uriType" use="required" />
<xs:attribute name="rel" type="uriType" /> <!-- { atomNCName | atomUri }? -->
<xs:attribute name="type" type="mediaType" />
<xs:attribute name="hreflang" type="languageTagType" />
<xs:attribute name="title" type="xs:string" />
<xs:attribute name="length" type="xs:string" />
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:simpleType name="languageTagType">
<xs:restriction base="xs:string">
<xs:pattern value="[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*" />
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="mediaType">
<xs:restriction base="xs:string">
<xs:pattern value=".+/.+" />
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="emailType">
<xs:restriction base="xs:string">
<xs:pattern value=".+@.+" />
</xs:restriction>
</xs:simpleType>
<xs:complexType name="textConstruct" mixed="true">
<xs:sequence>
<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:attribute name="type" type="xs:string" />
<xs:attributeGroup ref="commonAttributes"/>
</xs:complexType>
<xs:complexType name="dateConstruct">
<xs:simpleContent>
<xs:extension base="xs:dateTime">
<xs:attributeGroup ref="commonAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:simpleType name="uriType" type="xs:string" />
<xs:complexType name="extensionType" mixed="true">
<xs:sequence>
<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:anyAttribute />
</xs:complexType>
<xs:attributeGroup name="commonAttributes">
<xs:attribute ref="xml:base" />
<xs:attribute ref="xml:lang" />
<xs:anyAttribute/>
</xs:attributeGroup>
</xs:schema>
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