Next consider how it could be done with symbolic labels.
First you have to import the labels used in this document
by copying the file ,
saving it in /tmp/labels.pl say,
then adding anywhere in your document:
\externallabels{http://cbl.leeds.ac.uk/nikos/tex2html/doc/manual}%
{/tmp/labels.pl}
After that you can use the label `crossrefs' defined at the beginning of this
section42 as follows:
\externalref{crossrefs}
This will be translated into the appropriate hyper-link to this page.
If there are any changes in this document and you would like to
bring your document up-to date, you have to copy
again
and rerun the translator on your document. Of course if I move the
directory containing the HTML files for this document somewhere else,
then you would have to make a change in the argument of the
\externallabels command to reflect this.
It is obvious that some level of collaboration is required between authors trying to maintain cross-references between different documents. Using symbolic labels makes this a lot easier (especially for documents written by the same author).