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XT and absolute file names?

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Thanks to James Clark who pointed out that SYSTEM identifiers are
defined to be URLs in the XML standard, and relative URLs are to be
interpreted relative to the document they appear in.  This leads to a
problem:

Suppose you have home-grown DTDs and XSL stylesheets and stuff.
Suppose further that you wish to experiment with different versions.
For other Unix programs, there are environment variables which you can
set to a list of directories to search.  With nsgmls and friends, it
is possible to set $SGML_SEARCH_PATH to a list of directories which are
then searched for DTDs.  Thus, it is possible to try out new versions
of these files by changing an environment variable, and when it turns
out that the new versions work, the environment variable can be
changed for other users, as well.

But with XT this is not possible, since the files have to contain an
absolute URL if the referenced file is not in the current directory.

How do you deal with this kind of problem?  Maybe I'm approaching it
from the wrong end altogether?

kai
-- 
I like BOTH kinds of music.


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