<catRef>

<catRef> (category reference) specifies one or more defined categories within some taxonomy or text typology. 2.4.3 The Text Classification
Module header — 2 The TEI Header
In addition to global attributes In addition to global attributes
target identifies the categories concerned
Status Required
Datatype 1–∞ occurrences of  

<rng:ref name="data.pointer"/>
data.pointer
separated by whitespace
Values A series of one or more space-separated pointers (URIs) to category elements, typically located within a taxonomy element inside a TEI header.
scheme identifies the classification scheme within which the set of categories concerned is defined
Status Optional
Datatype 

<rng:ref name="data.pointer"/>
data.pointer
Values May supply the identifier of the associated taxonomy element.
Used by
textClass
May contain Empty element
Declaration 

<rng:element name="catRef">
 <rng:ref name="att.global.attributes"/>
 <rng:attribute name="target">
  <rng:list>
   <rng:oneOrMore>
    <rng:ref name="data.pointer"/>
   </rng:oneOrMore>
  </rng:list>
 </rng:attribute>
 <rng:optional>
  <rng:attribute name="scheme">
   <rng:ref name="data.pointer"/>
  </rng:attribute>
 </rng:optional>
 <rng:empty/>
</rng:element>
element catRef
{
   att.global.attributes,
   attribute target { list { data.pointer+ } },
   attribute scheme { data.pointer }?,
   empty
}
Example
<catRef target="#news #prov #sales2"/>
<!-- elsewhere -->
<taxonomy>
 <category xml:id="news">
  <catDesc>Newspapers</catDesc>
 </category>
 <category xml:id="prov">
  <catDesc>Provincial</catDesc>
 </category>
 <category xml:id="sales2">
  <catDesc>Low to average annual sales</catDesc>
 </category>
</taxonomy>
Note
The scheme attribute need be supplied only if more than one taxonomy has been declared