P5: Guidelines for Electronic Text Encoding and Interchange

<rng:element name="attRef">
<rng:ref name="att.global.attributes"/>
<rng:attribute name="name">
 <rng:ref name="data.word"/>
</rng:attribute>
<rng:empty/>
</rng:element>

element attRef { att.global.attributes, attribute name { data.word }, empty }