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<?xml version='1.0' encoding='UTF-8'?>

<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>
	<xs:element name='repositories'>
		<xs:complexType>
			<xs:choice minOccurs='0' maxOccurs='unbounded'>
				<xs:element name='repo' type='repoType'/>
			</xs:choice>
			<xs:attribute name='version' fixed='1.0' use='required'/>
		</xs:complexType>
		<xs:key name='repoKey'>
			<xs:selector xpath='repo'/>
			<xs:field xpath='name'/>
		</xs:key>
		<xs:unique name='descUniquityConstraint'>
			<xs:selector xpath='description'/>
			<xs:field xpath='@lang'/>
		</xs:unique>
		<xs:unique name='longDescUniquityConstraint'>
			<xs:selector xpath='longdescription'/>
			<xs:field xpath='@lang'/>
		</xs:unique>
		<xs:unique name='homepageSingleConstraint'>
			<xs:selector xpath='homepage'/>
			<xs:field xpath='@fake-only-once'/>
		</xs:unique>
	</xs:element>

	<xs:complexType name='repoType'>
		<xs:choice minOccurs='0' maxOccurs='unbounded'>
			<xs:element name='name' type='repoNameType'/>
			<xs:element name='description' type='descriptionType'/>
			<xs:element name='longdescription' type='descriptionType'/>
			<xs:element name='homepage' type='urlOnceType'/>
			<xs:element name='owner' type='ownerType'/>
			<xs:element name='source' type='sourceType'/>
			<xs:element name='feed' type='urlType'/>
		</xs:choice>
		<xs:attribute name='priority' type='xs:integer'/>
		<xs:attribute name='quality' type='repoQualityAttrType'
			use='required'/>
		<xs:attribute name='status' type='repoStatusAttrType'
			use='required'/>
	</xs:complexType>

	<xs:simpleType name='repoNameType'>
		<xs:restriction base='xs:token'>
			<!-- PMS 3.1.5 Repository Name -->
			<!-- note: this doesn't enforce 'not look like a version'
				 rule -->
			<xs:pattern value='[A-Za-z0-9_][A-Za-z0-9_-]*'/>
		</xs:restriction>
	</xs:simpleType>

	<xs:complexType name='descriptionType'>
		<xs:simpleContent>
			<xs:extension base='xs:token'>
				<xs:attribute name='lang' type='langAttrType' default='en'/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>

	<xs:complexType name='ownerType'>
		<xs:all>
			<xs:element name='email' type='emailType'
				minOccurs='1' maxOccurs='1'/>
			<xs:element name='name' type='xs:token'
				minOccurs='0' maxOccurs='1'/>
		</xs:all>
		<xs:attribute name='type' type='ownerTypeAttrType'/>
	</xs:complexType>

	<xs:complexType name='sourceType'>
		<xs:simpleContent>
			<xs:extension base='urlType'>
				<xs:attribute name='type' type='sourceTypeAttrType'
					use='required'/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>

	<!-- attributes -->
	<xs:simpleType name='langAttrType'>
		<xs:restriction base='xs:token'/>
	</xs:simpleType>
	
	<xs:simpleType name='repoQualityAttrType'>
		<xs:restriction base='xs:token'>
			<xs:enumeration value='core'/>
			<xs:enumeration value='stable'/>
			<xs:enumeration value='testing'/>
			<xs:enumeration value='experimental'/>
			<xs:enumeration value='graveyard'/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name='repoStatusAttrType'>
		<xs:restriction base='xs:token'>
			<xs:enumeration value='official'/>
			<xs:enumeration value='unofficial'/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name='ownerTypeAttrType'>
		<xs:restriction base='xs:token'>
			<xs:enumeration value='person'/>
			<xs:enumeration value='project'/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name='sourceTypeAttrType'>
		<xs:restriction base='xs:token'>
			<xs:enumeration value='bzr'/>
			<xs:enumeration value='cvs'/>
			<xs:enumeration value='darcs'/>
			<xs:enumeration value='git'/>
			<xs:enumeration value='mercurial'/>
			<xs:enumeration value='rsync'/>
			<xs:enumeration value='svn'/>
			<xs:enumeration value='tar'/>
		</xs:restriction>
	</xs:simpleType>

	<!-- generic types -->
	<xs:simpleType name='emailType'>
		<xs:restriction base='xs:token'>
			<!-- minimal safe regex -->
			<xs:pattern value="[^@]+@[^.]+\..+"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name='urlType'>
		<xs:restriction base='xs:token'>
			<!-- TODO: something better? -->
			<xs:pattern value="[^:]+:.+"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:complexType name='urlOnceType'>
		<xs:simpleContent>
			<xs:extension base="urlType">
				<xs:attribute name='fake-only-once'
					fixed='there can be at most one element of this type'/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>
</xs:schema>