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Subject: Does the constraint mechanism allow removal of core elements?


I am putting together authoring DTDs for DITA topics. One of the things that I would like to do is to constrain away elements that are meant for architectural extension rather than for authoring. For example, it would be nice to remove <data>. The DTD mechanics for incorporating this into the content model are straightforward:

Out-of-the-box:
<!ENTITY % data   "data
                   %ut-d-data_option;

">

Constrained:
<!ENTITY % data   "%ut-d-data_option;

">

Is there a way in DITA 1.3 to declare this as a constraint? I suspect that there isn't. If that's the case, then I claim that there should be a way to declare this because it is a reasonable thing to do.

--
Bob Thomas
+1 720 201 8260
Skype: bob.thomas.colorado
Instant messaging: Gmail chat (bob.thomas@tagsmiths.com) or Skype
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