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List:       xerces-j-dev
Subject:    Re: XInclude and general entities
From:       Murray Altheim <m.altheim () open ! ac ! uk>
Date:       2004-09-08 19:56:19
Message-ID: 413F63E3.9040403 () open ! ac ! uk
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Konrad Rokicki wrote:
> Hi,
> I don't know if this is even possible, but:
> I have an read-only XML file (report.xml) with a DTD that just defines
> some entities. I want to add some entities to this DTD but I can't
> change the file.. the solution I'm trying at the moment is to build
> another file with my own DTD, then XInclude the original file. I
> thought it might merge the DTD's but it doesn't seem to work. Is there
> any way to accomplish this, or does anyone have an alternative
> solution?
> Thanks,
> Konrad

Konrad,

Here's my interpretation of your problem and a possible solution:

  Original file (report.xml):

    <!DOCTYPE report SYSTEM "report.dtd">
    <report>
        <data>Here's some &euml;bermensch data.</data>
    </report>

  Original DTD (report.dtd):

    <!-- begin Report DTD -->
    <!ELEMENT report ( data* )>
    <!ELEMENT data ( #PCDATA )*>
    <!ENTITY euml "&#235;">
    <!-- end DTD -->

and you want to modify the available declarations in the DTD
without modifying either file. Change the name of "report.dtd"
to something else, say "report_orig.dtd". Then create a new
DTD file like this:

  New version of report.dtd:

    <!-- begin New Report DTD -->
    <!ELEMENT % report_orig SYSTEM "report_orig.dtd">
    %report_orig;
    <!ENTITY eacute "&#233;">
    <!ENTITY ecirc  "&#234;">
    <!-- end DTD -->

In this way, report.xml calls your new DTD, which in turn calls
the original.

If you want to redefine anything in the original DTD, you
pre-declare any of its contents prior to instantiating it.
Other than that, anything declared after its instantiation
is appended to the list of declarations.

Hope this helps,

Murray

......................................................................
Murray Altheim                    http://kmi.open.ac.uk/people/murray/
Knowledge Media Institute
The Open University, Milton Keynes, Bucks, MK7 6AA, UK               .

   The Pentagon announced that the US death toll had reached 1,001 -
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