Re: XInclude and general entities

[Murray Altheim]

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               .
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