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   Re: [xml-dev] Why you should avoid Notation Declarations (byKohsuke

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Elliotte Harold <elharo@metalab.unc.edu> writes:

>> You have a place in your XML document type for (e.g. hex-encoded)
>> BLOBs to be included or referenced.  Each BLOB in turn should be an
>> encoding of something using one of a delimited set of more-or-less
>> standard encodings.  You want to allow or require document authors to
>> signal which encoding they're using.
> How do notations improve on, for example, <data mime:type="image/jpeg"
> href="somefile.jpg"/>? Normally I like additional layers of
> indirection, but the NOTATION indirection has never seemed all that
> useful. What am I missing?

Not much.  The benefits I see are

  * some modest additional enforcement (your NOTATION-typed attributes
    have to name declared Notations);

  * some modest documentation/semantics support, in the form of the
    System and Public IDs in the referenced Notation;

  * some modest functional specification for free, i.e. the fact that
    the NOTATION-typed attribute applies to its element's content.

 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@inf.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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