RE: Re WF, V, and MSXML
In message <41135C785691CF11B73B00805FD4D2D702A3F8B9@R...> Chris Lovett writes: > > Regading all the discussion about the RMD attribute and > switching validation on and off and error recovery and so on.... I think MSXML has taken a reasonable position given the ambiguities... > > The reason MSXML doesn't implement RMD yet is because there are > problems with the RMD=IGNORE concept since ignoring the DTD can result Agreed. [I'm working from XML-lang-970331, which doesn't use RMD="IGNORE". Is this the same as "NONE"?] > in different data being given to the application - which generally is a > bad thing. The spec says it is an error to specify RMD=IGNORE if the ^^^^^^^^^^^ I would have said it was always a bad thing! > DTD contains any declarations of: > 1) attributes with default values, if elements to which > these attributes apply appear in the document instance without > specifying values for these attributes, or > 2) entities. (other than the built in entities), if > references to those entities appear in the document instance, or > 3) element types with element content, if white space > occurs in the document instance directly within any instance of those > types. > > The problem is that if the parser ignores the DTD, how can it > detect #1 above ? Also, the white space handling can be ambiguous. Agreed. I think the ERB have to consider this. I cannot see how a parser (even with RMD="NONE") may not read the DTD. I think the option is really related only to #3. > > So, MSXML currently takes the following approach: > - RMD attribute is not implmented yet, so if a DTD is > there it uses it. ...........^^^^ This is an ambigous word :-) It can mean either the creation of the proper document content and/or validation. > - If an error is found it stops. No error recovery is > attempted. :-) > - If you don't want validation, remove the DTD. Ah, but you cannot use entities or default attribute values. > - It is ok to not define some of the elements in the > DTD. This simply means that in the same document there is certain data > that you want to guarantee to be correct, and other data that is more > unknown in structure (but still well-formed). This is simply a side > effect of being able to parse a document without a DTD. This implies partial validation, which we don't have. There is no reason for defining any ELEMENTs if the document is not validated (and the element content not analysed). P. -- Peter Murray-Rust, domestic net connection Virtual School of Molecular Sciences http://www.vsms.nottingham.ac.uk/ xml-dev: A list for W3C XML Developers Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To unsubscribe, send to majordomo@i... the following message; unsubscribe xml-dev List coordinator, Henry Rzepa (rzepa@i...)
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