[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] FW: having problems with the "|" in field's element in the x
John's response was to a question I posted to him offline. I'll repost it here. I hope someone can give me an answer that doesn't require severe remedial total-immersion math courses to understand. > I'm trying to understand why this is so: > > If a document validator can know if a field occurrence is > optional in an instance's corresponding content model, then > how is it that a schema validator cannot know that a declared > key field is optional in its corresponding content model? > > The only thing I can think of that's different is that the > document validator may be able to narrow down the applicable > content models based on components that've already be read > from the document.
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