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<?xml version='1.0' encoding='UTF-8'?>
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>
<xs:element name='projects'>
<xs:complexType>
<xs:choice minOccurs='0' maxOccurs='unbounded'>
<xs:element name='project' type='projectType'>
<xs:unique name='descUniquityConstraint'>
<xs:selector xpath='description'/>
<xs:field xpath='@fake-only-once'/>
</xs:unique>
</xs:element>
</xs:choice>
</xs:complexType>
<xs:key name='projectKey'>
<xs:selector xpath='project'/>
<xs:field xpath='email'/>
</xs:key>
<xs:keyref name='subprojectRef' refer='projectKey'>
<xs:selector xpath='project/subproject'/>
<xs:field xpath='@ref'/>
</xs:keyref>
<!-- define additional keys to enforce exactly one element
of each kind -->
<xs:key name='projectNameKey'>
<xs:selector xpath='project'/>
<xs:field xpath='name'/>
</xs:key>
<xs:key name='projectURLKey'>
<xs:selector xpath='project'/>
<xs:field xpath='url'/>
</xs:key>
</xs:element>
<xs:complexType name='projectType'>
<xs:choice minOccurs='0' maxOccurs='unbounded'>
<xs:element name='email' type='emailType'/>
<xs:element name='name' type='xs:token'/>
<xs:element name='url' type='urlType'/>
<xs:element name='description' type='descriptionType'/>
<xs:element name='subproject' type='subprojectType'/>
<xs:element name='member' type='memberType'/>
</xs:choice>
</xs:complexType>
<xs:complexType name='descriptionType'>
<xs:simpleContent>
<xs:extension base='xs:token'>
<xs:attribute name='fake-only-once'
fixed='there can be at most one &lt;description/&gt; element'/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name='subprojectType'>
<xs:attribute name='inherit-members' type='numericBoolType'/>
<xs:attribute name='ref' type='projectRefType'/>
</xs:complexType>
<xs:simpleType name='projectRefType'>
<xs:restriction base='emailType'>
</xs:restriction>
</xs:simpleType>
<xs:complexType name='memberType'>
<xs:all>
<xs:element name='email' type='emailType'
minOccurs='1' maxOccurs='1'/>
<xs:element name='name' type='xs:token'
minOccurs='0' maxOccurs='1'/>
<xs:element name='role' type='xs:token'
minOccurs='0' maxOccurs='1'/>
</xs:all>
<xs:attribute name='is-lead' type='numericBoolType'/>
</xs:complexType>
<!-- 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="https?://\S+"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name='numericBoolType'>
<xs:restriction base='xs:integer'>
<xs:minInclusive value='0'/>
<xs:maxInclusive value='1'/>
</xs:restriction>
</xs:simpleType>
</xs:schema>