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Subject: Re: [docbook-apps] WARNING: cannot add @xml:base to node set root element. Relative paths may not work.
Hi Lars, Bob, Just one point: xsltproc does xml:base fixup on nodesets included through XInclude, so inside the document there are xml:base elements added properly. However, Bob's point still stands: if the top-level document is in non-current directory, it will break the external references. Speaking of Saxon, I am not sure if it does xml:base fixup properly on XIncluded modular documents from different directories. Originally, I was investigating a bug in libxml2 regarding xml:base fixup (pushed to master, will be in the next release), but I also tried Saxon. Here is a link to the thread on libxml2 mailing list (which has a small test case attached): https://mail.gnome.org/archives/xml/2013-April/msg00024.html In brief, Saxon seems to emit xml:base relative to top-level document rather than to the most recent point of inclusion. DocBook stylesheets (at least, 1.78.0 that I used) assume the location relative to the base of the including nodeset. xsltproc conforms to the expectations of DocBook stylesheets, and as far as I understand, to the XInclude specification. Regards, Alexey. On Tuesday, May 14, 2013 09:01:37 am Bob Stayton wrote: > Hi Lars, > You should get that message only when two conditions are met: > > 1. You are processing a DocBook 5 document with the non-namespaced > stylesheets. or > You are single-step profiling by using profile-docbook.xsl (probably > your case). > > and > > 2. You are using xsltproc (which lacks an extension function to get the > name of the current directory). > > With either condition in (1), the document is preprocessed into an internal > nodeset (a nodeset held in memory) before being processed by the > stylesheets. The internal nodeset loses all contact with the filesystem > where the files originated, so the preprocessing template tries to add > relative directory references into the internal nodeset by adding xml:base > attributes to preserve the relative locations. It uses an extension > function to get the original base directory of the document, but xsltproc > does not have a function to fetch that information, while Saxon and Xalan > do. > > So if you use modular doc and the modules are in various directories, that > directory structure information gets lost in the internal subset. If > your documents don't need such xml:base attributes, then it has no effect > on your output. > > You can avoid it by either using Saxon, or by using two-step profiling. > > Bob Stayton > Sagehill Enterprises > firstname.lastname@example.org > > > From: Lars Vogel > Sent: Tuesday, May 14, 2013 7:13 AM > To: DocBook Apps > Subject: [docbook-apps] WARNING: cannot add @xml:base to node set root > element. Relative paths may not work. > > > Hello, > > > since a while I get the following warning during the transformation with > the docbook distribution: > > > WARNING: cannot add @xml:base to node set root element. Relative paths may > not work. > > > > I'm not sure what triggers this warning, a Google search resulted in hints > about Docbook V5.0 but I'm still using Docbook 4.5. > > > I'm currently using the docbook-xsl-1.77.1 distribution and I think (but > I'm not sure) that I have this warning since I upgraded from 1.76. The > output looks ok to me, but this warning does not create a warm fussy > feeling. ;-) > > > Any hint how to get rid of this warning? > > > > Best regards, Lars