DTD question

[Ruth Bergman]

At 02:04 PM 7/1/1999 -0400, John Martin wrote:
>
>In a DTD, can I base the inclusion of an optional element on an
>attribute?  For example, I have:
>
><!ELEMENT NCSB-Message (Service-Version-Number, Service-Release-Number,
>Service-Completion-Code?, Service-Reason-Code?)>
><!ATTLIST NCSB-Message MESSAGE-TYPE (REQUEST | RESPONSE) #REQUIRED>
>
No.  I recall a previous discussion about this issue if you care to look it
up in the archives.  A possible solution is

<!ELEMENT NCSB-Message (Service-Version-Number, Service-Release-Number,
(REQUEST | RESPONSE))>
<!ELEMENT REQUEST (Service-Completion-Code, Service-Reason-Code)>
<!ELEMENT RESPONSE EMPTY>

Ruth.


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