<element name="presentationArc" substitutionGroup="xl:arc">
<complexType>
<annotation>
<documentation>
Extension of the extended link arc type for presentation arcs.
Adds a preferredLabel attribute that documents the role attribute
value of preferred labels (as they occur in label extended links).
</documentation>
</annotation>
<complexContent>
<extension base="xl:arcType">
<attribute name="preferredLabel" use="optional">
<simpleType>
<restriction base="anyURI">
<minLength value="1" />
</restriction>
</simpleType>
</attribute>
</extension>
</complexContent>
</complexType>
</element>
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