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From: Taco Hoekwater <taco@elvenkind.com>
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Subject: Re: ConTeXt FAQ format, XML with DTD
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Hi Hraban!

Two notes from me, on xml:lang usage.

1st). 
xml:lang is not the best solution to language independance. It doesnt
take transliteration into account, and it's specification does not cover
the full ISO language/country spec. Also, it can be quite hard to
intersept xml:lang in a processor.

That's why I always use this parameter entity:

<!ENTITY % lang  "language       CDATA      #IMPLIED
                  country        CDATA                #IMPLIED
                  translit       CDATA                #IMPLIED">

2nd)
Your DTD is not 100% ok. Most of it is just a matter of
merging ATTLIST specs, but this one:

  <!ATTLIST version	xml:lang IDREF "en">

is definitely wrong. The IDREF here (and in some other locations)
should be CDATA. Generally speaking, ID and IDREF do more harm
than good in XML files. It's better to express the Id<->Ref relation
in a schema and use CDATA in your Dtds always.

Sorry, no positive input from me today (no time) ;-)

-- 
groeten,

Taco