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Subject: [relax-ng-comment] How To ??
I want to construct a relax pattern for defining database triggers. A trigger can be fired on any or all of insert,update and delete events - but it must apply to at least one of these events. I initially had: <optional> <attribute name="INSERT"> <ref name="YESNO"/> </attribute> </optional> <optional> <attribute name="UPDATE"> <ref name="YESNO"/> </attribute> </optional> <optional> <attribute name="DELETE"> <ref name="YESNO"/> </attribute> </optional> but this fails to enforce the requirement that the trigger must apply to at least one of the three events. Changing it to: <oneOrMore> <choice> <attribute name="INSERT"> <ref name="YESNO"/> </attribute> <attribute name="UPDATE"> <ref name="YESNO"/> </attribute> <attribute name="DELETE"> <ref name="YESNO"/> </attribute> </choice> </oneOrMore> works OK for attributes, given the requirement for unique attribute names. But it would not work were elements to be used instead of attributes, as it would allow duplicates - when the requirement is for zero or one of each event type. So how would one define a suitable pattern for the case of using elements instead of attributes? I keep thinking that interleave should be able to do it, but I haven't been able to figure out how (yet). many tias, gary
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