<classSpec ident="att.id" module="MEI.shared" type="atts">
<desc>Attributes that uniquely identify an element.</desc>
<attList org="group">
<attDef ident="xml:id" usage="opt">
<desc>Regularizes the naming of an element and thus facilitates building links between it
and other resources. Each id attribute within a document must have a unique value.</desc>
<datatype maxOccurs="1" minOccurs="1">
<rng:data type="ID"/>
</datatype>
</attDef>
</attList>
</classSpec>