<refsDecl>

<refsDecl> (references declaration) specifies how canonical references are constructed for this text. [2.3.6.3 Milestone Method 2.3 The Encoding Description 2.3.6 The Reference System Declaration]
Module header — The TEI Header
Attributes
Member of
model.encodingDescPart
Contained by
header: encodingDesc
May contain
core: p
header: cRefPattern citeStructure refState
linking: ab
Example
<refsDecl>
 <cRefPattern matchPattern="([A-Za-z0-9]+) ([0-9]+):([0-9]+)"
  replacementPattern="#xpath(//body/div[@n='$1']/div[$2]/div3[$3])"/>
</refsDecl>

This example is a formal representation for the referencing scheme described informally in the following example.
Example
<refsDecl>
 <p>References are made up by concatenating the value for the
 <att>n</att> attribute on the highest level <gi>div</gi>
   element, followed by a space, followed by the sequential
   number of the next level <gi>div</gi> followed by a colon
   followed by the sequential number of the next (and lowest)
   level <gi>div</gi>.</p>
</refsDecl>
Content model 
<content>
 <alternate>
  <classRef key="model.pLike" minOccurs="1"
   maxOccurs="unbounded"/>
  <elementRef key="citeStructure"
   minOccurs="1" maxOccurs="unbounded"/>
  <elementRef key="cRefPattern"
   minOccurs="1" maxOccurs="unbounded"/>
  <elementRef key="refState" minOccurs="1"
   maxOccurs="unbounded"/>
 </alternate>
</content>
Schema Declaration 
<rng:element name="refsDecl">
 <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.declarable.attributes"/>
 <rng:choice>
  <rng:oneOrMore>
   <rng:ref name="model.pLike"/>
  </rng:oneOrMore>
  <rng:oneOrMore>
   <rng:ref name="citeStructure"/>
  </rng:oneOrMore>
  <rng:oneOrMore>
   <rng:ref name="cRefPattern"/>
  </rng:oneOrMore>
  <rng:oneOrMore>
   <rng:ref name="refState"/>
  </rng:oneOrMore>
 </rng:choice>
</rng:element>
element refsDecl
{
   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.declarable.attributes,
   ( model.pLike+ | citeStructure+ | cRefPattern+ | refState+ )
}