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Subject: Re: [docbook-apps] Using olinks in bibliography collection with processor's parameters with relative paths

Hi Giuseppe,
A relative path to an olink database is taken as relative to the DocBook document that 
contains the olink element. In the case of your books, that relative path is correct 
and those olinks resolve.

When a bibliography collection is processed, the biblio entries are processed directly 
from the collection.  That is, the stylesheet reads the 'bibliography.collection' 
parameter for the filename, uses the document() function to open the collection file, 
finds the biblio element that matches the id, and applies templates to that biblio 
element.  It does not first copy the biblio element into the original DocBook document 
and then process it.

So in the case of your bibliography collection, that is also a DocBook document that 
contains an olink, so the relative path to the database for that olink is taken as 
relative to the bibliography collection file.  You can see that starting from the 
location of your bibliography collection file, the relative path specified by the 
stylesheet param 
target.database.document=../../tools/database-files/nightly/olinkdb.xml is not a 
correct path to that file based on that starting point.  There is no separate param 
for the location of the olink database relative to the bibliography collection.

I think there might be a solution to this  problem using xml:base, but that will 
require some research and testing.  The quick solution is to put your bibliography 
database at the same directory level as your books, but in a different directory. 
That keeps it separate from any one book, and it can still be accessed with relative 
paths.  It won't be "above" your books, but it will be separate from them, and it 
should work.

Bob Stayton
Sagehill Enterprises

----- Original Message ----- 
From: "Giuseppe Monticelli" <monty@funambol.com>
To: <docbook-apps@lists.oasis-open.org>
Sent: Saturday, September 10, 2011 5:04 PM
Subject: [docbook-apps] Using olinks in bibliography collection with processor's 
parameters with relative paths

Good morning,

I'm experiencing a strange issue using 'bibliography.collection'
together with 'target.database.document' and relative paths with this

- DocBook 5.0
- DocBook XSL ns 1.76.1
- xsltproc (libxml 20632, libxslt 10124, libexslt 813)

I've created a bibliography collection document
(bibliography-collection.xml) that I populated with items that I would
like to use in the different 'Reference' sections of a collection of
three different guides. These guides in turn link to several sections
of each other.

A usual target database document (olinkdb.xml) is successfully used to
resolve olinks not only from a guide to another, but also between
different chapters of the same guide, since every chapter is also a
stand-alone XML document.

The bibliography-collection.xml document also contains two olinks
pointing to the titles of two guides of the mentioned guides
collection, since these titles vary from a release to the next one,
and so the titles referenced in the bibliography (the 'Reference'
sections of each guide) need to be dynamically updated.

This technique works perfectly ONLY when the
bibliography-collection.xml document is in IN THE SAME folder as the
XML documents representing the chapters of each guide.

The problems arise when I move the bibliography-collection.xml
document a folder above, in order to share it with all the guides,
avoiding to duplicate (triplicate) it in every folder containing the
chapters of each guide:

   xsltproc \
   --xinclude \
   --output funambol-carrier-edition-installation-and-operation-guide.html \
   --stringparam ignore.image.scaling 1 \
   --stringparam use.extensions 0 \
   --stringparam target.database.document
../../tools/database-files/nightly/olinkdb.xml \    <<<<<<<<<<<<<<<
   --stringparam current.docid cared-installation-and-operation-guide \
   --stringparam olink.doctitle yes \
   --stringparam html.stylesheet styles.css \
   --stringparam bibliography.collection
../../xml/bibliography-collection.xml \    <<<<<<<<<<<<<<<
   --stringparam bibliography.numbered 1 \
   ../../tools/html.xsl \

   warning: failed to load external entity
"../../../tools/database-files/nightly/olinkdb.xml" <<<<<<<<<<<<<<<
   Olink error: could not open target database
'../../tools/database-files/nightly/olinkdb.xml'. <<<<<<<<<<<<<<<
   Error: unresolved olink: targetdoc/targetptr = 'funambol-developers-guide/'.

Notice that when the bibliography-collection.xml document is
processed, the olinkdb.xml target database document is looked for in a
different directory than indicated, actually one more above (../../../
instead of ../../).

The only WORKAROUND I was able to find is to indicate the absolute
path to olinkdb.xml, i.e.

   --stringparam target.database.document

instead of

   --stringparam target.database.document

Is there a simple way to avoid at all indicating absolute paths?

Thank you in advance for every suggestion,

   Giuseppe Monticelli

Giuseppe Monticelli :: Funambol, Inc. :: http://docs.funambol.com

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