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   Re: [xml-dev] Data streams and schema use and identification

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Speaking as an SGML Neanderthal, schemas sure went a lot further in 
breaking an old SGML paradigm than I ever thought. One of the biggest 
comforts of SGML was the idea of "No surprises" everything should be 
declared and obvious so I would know why something failed.

I swallowed hard on the idea of well-formed documents, but have learned to 
live with that, but now not even being able to have a standard way to 
determine if this XML file is supposed to be compliant with a DTD or schema 
is almost too much to accept.


At 09:51 AM 4/23/2003 +0100, Henry S. Thompson wrote:
>Danny Vint <dvint@mindspring.com> writes:
> > If a data stream is supposed to be validated with a schema or
> > processed against one, is there anything REQUIRED to be in that stream
> > that would identify it with schema processing?
>Wrt W3C XML Schema, the answer is "No, nothing is required".
> > I know that some tools will allow you to take a well-formed data
> > stream and via some outside mechanism identify that it should be
> > validated with a DTD or Schema without reference (or maybe counter) to
> > anything in the data stream.
>Wrt W3C XML Schema, such tools are conformant, the REC makes explicit
>provision for this.
> > What tools do to work around issues of schema and DTD
> > management/location (catalogs or feeding a value in some other manner)
> > should not necessarily be considered standard or at least good
> > practice.
>The W3C XML Schema REC actually includes a list of recommended
>strategies [1], but doesn't mandate any of them.
>[1] http://www.w3.org/TR/xmlschema-1/#schema_reference
>   Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
>                       Half-time member of W3C Team
>      2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
>             Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
>                      URL: http://www.ltg.ed.ac.uk/~ht/
>  [mail really from me _always_ has this .sig -- mail without it is forged 
> spam]


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