Re: What are schemata
Jarle Stabell wrote: > > So by 'schema', you mean basically what is also known as 'type'? Here are a few of my concerns with the word type: * I think that it implies a set of legal operations, (e.g. the boolean type has logical operations, the integer type has integral operations, etc.) But in generic markup, we want the set of operations to be open-ended. In type systems, operations are "open-ended" in the sense that you can build up complex ones (e.g. power) from basic ones (addition), but in generic markup, you work directly on the data. * Each XSchema document will probably contain many types -- one per element, perhaps some data types and attribute types also. * As with DTDs, you will probably be able to use any element type in an XSchema as the "top", so any particular XSchema will not itself define a particular document type, but one per possible "root element" -- again several conceptual types. * Your sentence above conflates levels. Even if we use the word type, the schema is not a type. The schema *defines* a type. But at some level, yes, schemas define types. They define subtypes of the type "XML document". Some subset of all XML documents conform to a particular schema. I just don't think that the word is intuitively applied here. The types *in* the schema (element type, attribute types, document types) will get confused with the type the schema defines (a subtype of XML document). Paul Prescod - http://itrc.uwaterloo.ca/~papresco Three things see no end: A loop with exit code done wrong A semaphore untested, and the change that comes along http://www.geezjan.org/humor/computers/threes.html xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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