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Subject: Re: [docbook] Possible Catalog Issues for DocBook 4/5: Missing 'www' in System Identifier?

Hi Thomas,
I don't have an answer for you, but I will put the question on the agenda of the DocBook Technical Committee which meets this Wednesday.

By the way, I like your (unintentional) new word "stumpled", a combo of stumped and stumbled. 8^)

Bob Stayton
Sagehill Enterprises

From: "Thomas Schraitle" <tom_schr@web.de>
Sent: Monday, July 15, 2013 12:04 AM
To: <docbook@lists.oasis-open.org>
Subject: [docbook] Possible Catalog Issues for DocBook 4/5: Missing 'www' in System Identifier?


not sure if this can be considered as a "bug", but I've stumpled over an
entry in the catalog files, both for DocBook 4 and 5. Maybe someone can
clarify it.

For a long time, the DocBook schema has got two official _system_(!)
identifiers: the one from OASIS and the docbook.org domain. That's the
reason why you can find in the DocBook 4.5 catalog file[1] two entries
to access the DocBook 4.5 DTD:

 <system systemId="http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd";
 <system systemId="http://docbook.org/xml/4.5/docbookx.dtd";

Well, I had always the (wrong?) impression, that the system identifier
for the docbook.org domain contains a "www". Using a Web browser to
access the URL is usually not a problem (as both URLs work, with and
without "www"). However, an XML catalog resolver wants the *exact*
string. If someone tries to use such a system identifier, he will get
into problems.

For example, oXygen 15 creates a DocBook file which contains the "www".
However, they also use the above catalog file. I guess, this problem
hasn't occured yet as all the XML tools try to find the public
identifier first. Assuming there is a correct entry in the XML catalog,
the system identifier never gets resolved (and doesn't need to).

Is this ambiguous? I would say yes. Or at least confusing.

What would the experts recommend here?


---- Reference
[1] http://www.docbook.org/xml/4.5/catalog.xml

   Thomas Schraitle

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