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Serialization of @xml:base after p:xinclude with Base URI Fixup

From: Dr. Yves Forkl (SRZ) <Y.Forkl@srz.de>
Date: Thu, 14 Jun 2012 16:07:48 +0200
Message-ID: <4FD9F034.2020103@srz.de>
To: XProc Dev <xproc-dev@w3.org>
Have you ever tried to delete an attribute which matches a particular value, but couldn't even access the attribute's current value?

If this sounds curious to you, here is the full story. In my pipeline I have:

  <p:iteration-source select="//xi:include"/>
  <p:xinclude fixup-xml-base="true"/>
  <p:viewport match="/*[matches(@xml:base, '/xyz/')]">
     <p:delete match="/*/@xml:base"/>

With Calabash, I observe that the value of @xml:base is serialized correctly after the end of this step (and subsequent steps).

However, the serialized attribute value is obviously _different_ from the value @xml:base has acquired just after the step <p:xinclude>. For instance, in <p:viewport> the regex '/xyz/' reproducibly matches the value _even though_ the serialized version of @xml:base does _not_ contain '/xyz/'. I suspect this occurs when the Base URI of the xincluded file had to be determined using a path that contained directory '/xyz/' while the latter is not contained in the serialized value of @xml:base.

This leaves me with two questions:

1) How can I determine the value @xml:base has just after step <p:xinclude fixup-xml-base="true"/>? (Would I have to implement Base URI Fixup [1] myself in XProc?)

2) How could I amend my pipeline to "force" @xml:base to obtain its "real" value before I am trying to match it?


[1]: http://www.w3.org/TR/xinclude/#base

P.S.: Don't ask why I have to fiddle with @xml:base at all, it's a little scary...

Dr. Yves Forkl - Softwareentwicklung
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Received on Thursday, 14 June 2012 14:08:17 UTC

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