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Re: Data streams and schema use and identification

• To: xml-dev@l...
• Subject: Re: Data streams and schema use and identification
• From: Dan Vint <dvint@m...>
• Date: Wed, 23 Apr 2003 08:04:24 -0700
• In-reply-to: <f5bn0ih8ulp.fsf@e...>
• References: <5.2.1.1.2.20030422121632.02dd81f0@p...><5.2.1.1.2.20030422121632.02dd81f0@p...>

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.

..dan

At 09:51 AM 4/23/2003 +0100, Henry S. Thompson wrote:
>Danny Vint <dvint@m...> 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.
>
>ht
>
>[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@c...
>                      URL: http://www.ltg.ed.ac.uk/~ht/
>  [mail really from me _always_ has this .sig -- mail without it is forged 
> spam]

• Follow-Ups:
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• References:
  • Data streams and schema use and identification
    • From: Danny Vint <dvint@m...>
  • Re: Data streams and schema use and identification
    • From: ht@c... (Henry S. Thompson)

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