[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Re: Language Theorie concerning XML Schema (heavy,at least
> it leaves it up to the implementor to decide which > references *are* needed for validation, and as far as I can > see, an implementation that needs *all" references is > conformant according to the letter. > Just to add to this with a concrete example: if a content model refers to element E, then a validator needs to know all the elements in the substitution group of E. If there's an element Z in the schema whose substitition group membership is a dangling reference, do you say "I don't know whether element Z is in the substitution group of E, therefore I can't validate", or do you assume that Z isn't in the substitution group of E. Same applies to a complex type derived by extension from an unknown base type. I'm pretty sure the spec doesn't give you the answer to this. Michael Kay http://www.saxonica.com/
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