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Controlling link destination DOCTYPE

• From: john@d... (John Tigue)
• To: <xml-dev@i...>
• Date: Mon, 6 Apr 1998 12:54:50 -0700

The below document asks the question "how do you tell the processor that the
destination of a link must be a document complying to DTD X?"

<!DOCTYPE foo
[
<!ELEMENT foo ( linkToABarDoc ) >

<!-- I want tell the parser that the BarDecls DTD is a notation -->
<!NOTATION BarDecls PUBLIC "The BarDecls PUBLIC ID" >

<!-- I want tell the parser that the 'linkToABarDoc' element is a
     link to a instance doc of the BarDecls DTD

     Is there any way (XML, HyTime, etc.) to declare that an ENTITY
     attribute is not only an ENTITY attribute but that the value
     must be of a particular declared NOTATION? That is, the
     entity must be declared to have a particular NDATA? Or is this
     simply application level constraints not parser level?

     Some other attributes would be needed to declare the link-ness of
     this element type.
     -->
<!ELEMENT linkToABarDoc EMPTY >
<!ATTLIST linkToABarDoc
          docLinkingTo ENTITY #REQUIRED
          >

<!-- ============================================================= -->
<!-- All the above would really go in an external subset but this
     e.g. is all in one doc for clarity.
     The stuff below this comment would occur in the internal subset
     -->

<!-- Here it is established that myBarDoc is an instance document
     of the BarDecls DTD -->
<!ENTITY myBarDoc PUBLIC "a" "b" NDATA BarDecls >

]>

<foo>
     <linkToABarDoc docLinkingTo="myBarDoc" />
</foo>



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