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Re: Data streams and schema use and identification

• To: Danny Vint <dvint@m...>
• Subject: Re: Data streams and schema use and identification
• From: ht@c... (Henry S. Thompson)
• Date: 23 Apr 2003 09:51:30 +0100
• Cc: xml-dev@l...
• In-reply-to: <5.2.1.1.2.20030422121632.02dd81f0@p...>
• References: <5.2.1.1.2.20030422121632.02dd81f0@p...>
• Sender: ht@i...
• User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Portable Code)

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]

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