(eplain.info)Cross-references

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4.9 Cross-references
====================

It is often useful to refer the reader to other parts of your document;
but putting literal page, section, equation, or whatever numbers in the
text is certainly a bad thing.

   Eplain therefore provides commands for symbolic cross-references. It
uses an auxiliary file with extension .aux (and the same root name as
your document) to keep track of the information. Therefore, it takes two
passes to get the cross-references right--one to write them out, and one
to read them in. Eplain automatically reads the .aux file at the first
reference; after reading it, Eplain reopens it for writing.

   You can control whether or not Eplain warns you about undefined
labels. Note: Citations.

   Labels in Eplain's cross-reference commands can use characters of
category code eleven (letter), twelve (other), ten (space), three (math
shift), four (alignment tab), seven (superscript), or eight (subscript).
For example, '(a1 $&^_' is a valid label (assuming the category codes of
plain TeX), but '%#\{' has no valid characters.

   You can also do symbolic cross-references for bibliographic citations
and list items. Note: Citations, and Note: Lists.

   Eplain can create hypertext links for the cross-references (Note:
Cross-reference hyperlinks).

Defining generic references

Using generic references