[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] XML schema : refer problem
Suppose I have the following document : <?xml version="1.0" encoding="UTF-8"?> <organisation> <person id="1"> <poll id="a"> <answer id="1"/> <answer id="3"/> </poll> </person> <poll id="a"> <question id="1"/> <question id="2"/> </poll> <poll id="b"> <question id="1"/> <question id="3"/> </poll> </organisation> In my schema definition i want the following constraints : - a poll has a unique id within an organisation : key on id in organisation scope : No Problem - a question has a unique id within a poll : key on id in poll scope : No Problem - a person can only answer a defined poll : keyref to the key of poll : No problem - a person can only answer questions of the referenced poll : ... problem ... How do I do that? The combination poll-id question-id is unique but I can't define a key on that combination which I need to refer to. Extra question : how can I ensure that the person answers every question? The question element contains lots of information that I don't want to duplicate...
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