<?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'
			use='required'/>
	</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'>
			<!-- ISO 639-1 language codes -->
			<xs:enumeration value='aa'/>
			<xs:enumeration value='ab'/>
			<xs:enumeration value='ae'/>
			<xs:enumeration value='af'/>
			<xs:enumeration value='ak'/>
			<xs:enumeration value='am'/>
			<xs:enumeration value='an'/>
			<xs:enumeration value='ar'/>
			<xs:enumeration value='as'/>
			<xs:enumeration value='av'/>
			<xs:enumeration value='ay'/>
			<xs:enumeration value='az'/>
			<xs:enumeration value='ba'/>
			<xs:enumeration value='be'/>
			<xs:enumeration value='bg'/>
			<xs:enumeration value='bh'/>
			<xs:enumeration value='bi'/>
			<xs:enumeration value='bm'/>
			<xs:enumeration value='bn'/>
			<xs:enumeration value='bo'/>
			<xs:enumeration value='bo'/>
			<xs:enumeration value='br'/>
			<xs:enumeration value='bs'/>
			<xs:enumeration value='ca'/>
			<xs:enumeration value='ce'/>
			<xs:enumeration value='ch'/>
			<xs:enumeration value='co'/>
			<xs:enumeration value='cr'/>
			<xs:enumeration value='cs'/>
			<xs:enumeration value='cs'/>
			<xs:enumeration value='cu'/>
			<xs:enumeration value='cv'/>
			<xs:enumeration value='cy'/>
			<xs:enumeration value='cy'/>
			<xs:enumeration value='da'/>
			<xs:enumeration value='de'/>
			<xs:enumeration value='de'/>
			<xs:enumeration value='dv'/>
			<xs:enumeration value='dz'/>
			<xs:enumeration value='ee'/>
			<xs:enumeration value='el'/>
			<xs:enumeration value='el'/>
			<xs:enumeration value='en'/>
			<xs:enumeration value='eo'/>
			<xs:enumeration value='es'/>
			<xs:enumeration value='et'/>
			<xs:enumeration value='eu'/>
			<xs:enumeration value='eu'/>
			<xs:enumeration value='fa'/>
			<xs:enumeration value='fa'/>
			<xs:enumeration value='ff'/>
			<xs:enumeration value='fi'/>
			<xs:enumeration value='fj'/>
			<xs:enumeration value='fo'/>
			<xs:enumeration value='fr'/>
			<xs:enumeration value='fr'/>
			<xs:enumeration value='fy'/>
			<xs:enumeration value='ga'/>
			<xs:enumeration value='ga'/>
			<xs:enumeration value='Ga'/>
			<xs:enumeration value='gd'/>
			<xs:enumeration value='gl'/>
			<xs:enumeration value='gn'/>
			<xs:enumeration value='gu'/>
			<xs:enumeration value='gv'/>
			<xs:enumeration value='ha'/>
			<xs:enumeration value='he'/>
			<xs:enumeration value='hi'/>
			<xs:enumeration value='ho'/>
			<xs:enumeration value='hr'/>
			<xs:enumeration value='ht'/>
			<xs:enumeration value='hu'/>
			<xs:enumeration value='hy'/>
			<xs:enumeration value='hy'/>
			<xs:enumeration value='hz'/>
			<xs:enumeration value='ia'/>
			<xs:enumeration value='id'/>
			<xs:enumeration value='ie'/>
			<xs:enumeration value='ig'/>
			<xs:enumeration value='ii'/>
			<xs:enumeration value='ik'/>
			<xs:enumeration value='io'/>
			<xs:enumeration value='is'/>
			<xs:enumeration value='is'/>
			<xs:enumeration value='it'/>
			<xs:enumeration value='iu'/>
			<xs:enumeration value='ja'/>
			<xs:enumeration value='jv'/>
			<xs:enumeration value='ka'/>
			<xs:enumeration value='ka'/>
			<xs:enumeration value='kg'/>
			<xs:enumeration value='ki'/>
			<xs:enumeration value='kj'/>
			<xs:enumeration value='kk'/>
			<xs:enumeration value='kl'/>
			<xs:enumeration value='km'/>
			<xs:enumeration value='kn'/>
			<xs:enumeration value='ko'/>
			<xs:enumeration value='kr'/>
			<xs:enumeration value='ks'/>
			<xs:enumeration value='ku'/>
			<xs:enumeration value='kv'/>
			<xs:enumeration value='kw'/>
			<xs:enumeration value='ky'/>
			<xs:enumeration value='la'/>
			<xs:enumeration value='lb'/>
			<xs:enumeration value='lg'/>
			<xs:enumeration value='li'/>
			<xs:enumeration value='ln'/>
			<xs:enumeration value='lo'/>
			<xs:enumeration value='lt'/>
			<xs:enumeration value='lu'/>
			<xs:enumeration value='lv'/>
			<xs:enumeration value='mg'/>
			<xs:enumeration value='mh'/>
			<xs:enumeration value='mi'/>
			<xs:enumeration value='mi'/>
			<xs:enumeration value='mk'/>
			<xs:enumeration value='mk'/>
			<xs:enumeration value='ml'/>
			<xs:enumeration value='mn'/>
			<xs:enumeration value='mr'/>
			<xs:enumeration value='ms'/>
			<xs:enumeration value='ms'/>
			<xs:enumeration value='mt'/>
			<xs:enumeration value='my'/>
			<xs:enumeration value='my'/>
			<xs:enumeration value='na'/>
			<xs:enumeration value='nb'/>
			<xs:enumeration value='nd'/>
			<xs:enumeration value='ne'/>
			<xs:enumeration value='ng'/>
			<xs:enumeration value='nl'/>
			<xs:enumeration value='nl'/>
			<xs:enumeration value='nn'/>
			<xs:enumeration value='no'/>
			<xs:enumeration value='nr'/>
			<xs:enumeration value='nv'/>
			<xs:enumeration value='ny'/>
			<xs:enumeration value='oc'/>
			<xs:enumeration value='oj'/>
			<xs:enumeration value='om'/>
			<xs:enumeration value='or'/>
			<xs:enumeration value='os'/>
			<xs:enumeration value='pa'/>
			<xs:enumeration value='pi'/>
			<xs:enumeration value='pl'/>
			<xs:enumeration value='ps'/>
			<xs:enumeration value='pt'/>
			<xs:enumeration value='qu'/>
			<xs:enumeration value='rm'/>
			<xs:enumeration value='rn'/>
			<xs:enumeration value='ro'/>
			<xs:enumeration value='ro'/>
			<xs:enumeration value='ru'/>
			<xs:enumeration value='rw'/>
			<xs:enumeration value='sa'/>
			<xs:enumeration value='sc'/>
			<xs:enumeration value='sd'/>
			<xs:enumeration value='se'/>
			<xs:enumeration value='sg'/>
			<xs:enumeration value='si'/>
			<xs:enumeration value='sk'/>
			<xs:enumeration value='sk'/>
			<xs:enumeration value='sl'/>
			<xs:enumeration value='sm'/>
			<xs:enumeration value='sn'/>
			<xs:enumeration value='so'/>
			<xs:enumeration value='sq'/>
			<xs:enumeration value='sq'/>
			<xs:enumeration value='sr'/>
			<xs:enumeration value='ss'/>
			<xs:enumeration value='st'/>
			<xs:enumeration value='su'/>
			<xs:enumeration value='sv'/>
			<xs:enumeration value='sw'/>
			<xs:enumeration value='ta'/>
			<xs:enumeration value='te'/>
			<xs:enumeration value='tg'/>
			<xs:enumeration value='th'/>
			<xs:enumeration value='ti'/>
			<xs:enumeration value='tk'/>
			<xs:enumeration value='tl'/>
			<xs:enumeration value='tn'/>
			<xs:enumeration value='to'/>
			<xs:enumeration value='tr'/>
			<xs:enumeration value='ts'/>
			<xs:enumeration value='tt'/>
			<xs:enumeration value='tw'/>
			<xs:enumeration value='ty'/>
			<xs:enumeration value='ug'/>
			<xs:enumeration value='uk'/>
			<xs:enumeration value='ur'/>
			<xs:enumeration value='uz'/>
			<xs:enumeration value='ve'/>
			<xs:enumeration value='vi'/>
			<xs:enumeration value='vo'/>
			<xs:enumeration value='wa'/>
			<xs:enumeration value='wo'/>
			<xs:enumeration value='xh'/>
			<xs:enumeration value='yi'/>
			<xs:enumeration value='yo'/>
			<xs:enumeration value='za'/>
			<xs:enumeration value='zh'/>
			<xs:enumeration value='zh'/>
			<xs:enumeration value='zu'/>
		</xs:restriction>
	</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="[^:\s]+:\S+"/>
		</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>