(reftex)xr (LaTeX package)


`xr': Cross-Document References
===============================

   The LaTeX package `xr' makes it possible to create references to
labels defined in external documents.  The preamble of a document using
`xr' will contain something like this:

     \usepackage{xr}
     \externaldocument[V1-]{volume1}
     \externaldocument[V3-]{volume3}

and we can make references to any labels defined in these external
documents by using the prefixes `V1-' and `V3-', respectively.

   RefTeX can be used to create such references as well.  Start the
referencing process normally, by pressing `C-c )'.  Select a label type
if necessary.  When you see the label selection buffer, pressing `x'
will switch to the label selection buffer of one of the external
documents.  You may then select a label as before and RefTeX will
insert it along with the required prefix.

   For this kind of inter-document cross-references, saving of parsing
information and the use of multiple selection buffers can mean a large
speed-up (Note: Optimizations).


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