<cRefPattern>

<cRefPattern> (canonical reference pattern) specifies an expression and replacement pattern for transforming a canonical reference into a URI. [2.3.6.3 Milestone Method 2.3.6 The Reference System Declaration 2.3.6.2 Search-and-Replace Method]
Module header — The TEI Header
Attributes
Contained by
header: refsDecl
May contain
core: p
linking: ab
Note

The result of the substitution may be either an absolute or a relative URI reference. In the latter case it is combined with the value of xml:base in force at the place where the cRef attribute occurs to form an absolute URI in the usual manner as prescribed by XML Base.
Example
<cRefPattern matchPattern="([1-9A-Za-z]+)\s+([0-9]+):([0-9]+)"
 replacementPattern="#xpath(//div[@type='book'][@n='$1']/div[@type='chap'][@n='$2']/div[@type='verse'][@n='$3'])"/>
Content model 
<content>
 <classRef key="model.pLike" minOccurs="0"
  maxOccurs="unbounded"/>
</content>
Schema Declaration 
<rng:element name="cRefPattern">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.rendition.attributes"/>
 <rng:ref name="att.global.linking.attributes"/>
 <rng:ref name="att.global.analytic.attributes"/>
 <rng:ref name="att.global.facs.attributes"/>
 <rng:ref name="att.global.change.attributes"/>
 <rng:ref name="att.global.responsibility.attributes"/>
 <rng:ref name="att.global.source.attributes"/>
 <rng:ref name="att.patternReplacement.attributes"/>
 <rng:zeroOrMore>
  <rng:ref name="model.pLike"/>
 </rng:zeroOrMore>
</rng:element>
element cRefPattern
{
   att.global.attributes,
   att.global.rendition.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   att.global.responsibility.attributes,
   att.global.source.attributes,
   att.patternReplacement.attributes,
   model.pLike*
}