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

["Bob Stayton" <bobs@sagehill.net>]

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
bobs@sagehill.net

--------------------------------------------------
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?

> Hi,
>
> 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";
>          uri="docbookx.dtd"/>
>  <system systemId="http://docbook.org/xml/4.5/docbookx.dtd";
>          uri="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?
>
> Thanks!
>
> ---- Reference
> [1] http://www.docbook.org/xml/4.5/catalog.xml
>
> --
> Gruß/Regards,
>    Thomas Schraitle
>
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