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[DTD] defining elements depending on attribute

From: "Ekim" <the.newsletter@---.--->
To: NULL
Date: 12/1/2004 9:57:00 PM
hello,

I wanna create a new DTD for a protocol - therefore I have one question:

is there a way to define elements depending on a special attribute-value?
I guess I've confused you so far, so that's what I really mean:

I have got an element "sensor":
<!ELEMENT sensor ((longitude, latitude) | (direction, speed))>

This element has an attribute "type":
<!ATTLIST sensor type (GPS | WIND) "GPS">

My question now is, if it is possible that the sub-elements of "sensor" are
"longitude, latitude" only in the case when the type-attribute = "GPS".
When the type-attribute = "WIND", the sub-elements shall exactly be
"direction, speed".

Currently it doesn't matter which value the type-attribute actually has -
the subelements can either be (longitude, latitude) OR (direction, speed).
But I want them only when the attribute is set accordingly.

Do you have an idea how to do that? Is there a way in DTD to specify such
things?

I appreciate any help,

ekim


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