<xs:element name="collab">
<xs:complexType>
<xs:sequence>
<xs:choice maxOccurs="unbounded">
<xs:element ref="docbook:person" />
<xs:element ref="docbook:personname" />
<xs:element ref="docbook:org" />
<xs:element ref="docbook:orgname" />
</xs:choice>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="docbook:affiliation" />
</xs:sequence>
<xs:attribute name="role" />
<xs:attributeGroup ref="docbook:db.common.attributes" />
<xs:attributeGroup ref="docbook:db.common.linking.attributes" />
</xs:complexType>
</xs:element>
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