Inside the Document: DOCTYPE and Namespaces
- DOCTYPE This is supposed to be where XML documents announce their structure. Pluses: Widely supported, well understood. Minuses: Internal subset open to abuse, non-validating parsers can skip external references.
- Namespaces Namespaces don't actually identify document types, but they do identify element types. Used on the root element, that could be about the same. Pluses: Unique identifiers allow mixing of document types. Minues: Identification is the only function supported by namespaces.
- Incompatible Toolsets A significant minus of both of these options is that they are incompatible in a well-known group of cases.
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Copyright 1999 Simon St.Laurent