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   RE: I wonder ...

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  • From: "DuCharme, Robert" <DuCharmR@moodys.com>
  • To: XML Development <xml-dev@ic.ac.uk>, "'Kyu Hwang Yeon'" <kyu-hwang.yeon@bauer-partner.de>
  • Date: Tue, 2 Mar 1999 14:45:30 -0500

>I'd like to reuse book.dtd inside library.dtd without rewriting 
>whole library.dtd.

(First, this is really a question for the xml-l list or comp.text.xml.
xml-dev is for people developing XML software.)

This is what external parameter entities are for. Parameter entities
store pieces of a DTD, and "external" means "stored in a separate file"
(or the equivalent construct in your operation system). For example, if
book.dtd is the following:

  <!ELEMENT book (chapter+)>
  <!ELEMENT chapter (par+)>
  <!ELEMENT par (#PCDATA)>

your library.dtd file could look like this:   

  <!ELEMENT library (shelf+)>
  <!ELEMENT shelf (book+)>
  <!ENTITY % bookdtd "book.dtd">

Bob DuCharme       www.snee.com/bob       <bob@  
snee.com>  see www.snee.com/bob/xmlann for "XML:
The Annotated Specification" from Prentice Hall.

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