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Subject: Duplicate index entries to the same page
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With the standard Docbook generated
index (for FO), there is no provision for eliminating duplicate identical
references to the same page, resulting in index entries which look like
this:
which is not very appealing.
The problem is, of course, that there is no absolute way in XSLT to avoid this,
since the actual page numbers are generated by the rendering engine, after the
XSLT processing is already finished. There are solutions which involve a
two-pass process, which may be too involved for many users. I have developed a
partial solution (not for Docbook, as of yet) in which the @id to based on which
the page numbers in the index are generated is not the id of the indexterm
element itself, rather of the closest ancestral section or subsection. In the
process of collecting all the index entries from the document, a check is made
if the same entry is already listed under that section; if so, the new entry is
ignored. If the sections are roughly one page in size, this procedure
should eliminate most of the duplicate entries (if the sections are too large,
then even entries on different pages will be eliminated, which is not the
desired behavior). A collateral benefit of this is that the link from the index
will lead to the beginning of the section which contains the indexterm, which
will often be more useful than being plunked down in the middle of a paragraph.
Have any other users been bothered by this problem? If there is a demand, I can
update the templates accordingly. (It would also be possible to introduce a
parameter which would determine if the user wants the old kind of index, without
trying to remove duplicate entries [for example, for a document which has very
large sections] or the new kind).
David Zalkin
Technology Consultant Tech-Tav Documentation Ltd. +972 (0)57 313 8506 |
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