<refsDecl> (references declaration) specifies how canonical references are constructed for this text.
Attributes:
doctype identifies the document type within which this reference declaration is used.
Datatype: NAME
Values: must be the name of a document type
Default: TEI.2
Example 
<refsDecl>
  <step delim=":"
        from="DESCENDANT (1 DIV1 N %1) CHILD (1 HEAD) STRING %2"
        to  ="PARENT"
        refunit="chapter" >
  <step length=4
        from="CHILD (ALL DIV2 N %3)"
        refunit="section" >
</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 <hi>n</hi> attribute on each DIV1 element,
  followed by a colon, followed by the first six characters
  of the first HEAD element found within it and a
  space, followed by exactly four characters derived from the
  value of the <hi>n</hi> attribute on the next included
  DIV2 element.
</refsDecl>
Note
Tagsetauxiliary tag set for TEI headers
Class
Filenameteihdr2
Content:
ParentsencodingDesc
Childrenp state step
Declaration
<!ELEMENT refsDecl      - O  (p+ | step+ | state+)              >
<!ATTLIST refsDecl           %a.global
          doctype            NAME                TEI.2          >
See 5.3.5.3 ; 5.3 ; 5.3.5

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