Steven Livingstone, ITS, SENM
steven.livingstone at scotent.co.uk
Wed Jun 16 13:17:07 BST 1999
I am relatively new to using the data schema's, but I immediately found them
much more aligned to the XML documents I was creating.
Don't get me wrong, neither are particulary difficult to use, but I like the
idea of describing all XML using an XML-based language.
For example, the chances are you shall write a lot more XML documents than
you will DTD/Schema for validation. I find it a lot easier to read Schema
validation than DTD.
Of course there is also the lack of typed attributes etc.. in DTD's.
Further down the line (and please correct me if I wrong)...
...would having an XML-based schema not give you the potential to create
schema from schema ?? So if you had something which require specific
validation using subsets of other validation schema, you could produce it by
combining parts from the two (dare I say using some equivalent to XSL) ??
Could you do this with DTD's ?
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> -----Original Message-----
> From: Paul Prescod [SMTP:paul at prescod.net]
> Sent: 16 June 1999 12:45
> To: xml-dev at ic.ac.uk
> Subject: Re: X-Schema
> Steven Livingstone wrote:
> > I for one hope that the final version is close to the XML DR as they are
> > lot more intuitive and easier to use than DTD's
> I would be curious to hear your opinion on why XML-syntax schemas are so
> much easier.
> My observation is that XML Data Reduce Schemas are only easier than DTDs
> for the first week at which point they become harder to read, to
> understand and to maintain. They are, however, easier to parse. My
> inclination is to write off the claims that XML-syntax schemas are so much
> easier as merely bias against the syntactically unfamiliar, similar to
> parentheses and whitespace paranoia. At the end of a day of training
> (brainwashing) my students usually say: "Why would I spend twenty lines of
> XML syntax saying what a DTD can say in one line?"
> I am genuinely interested in improving XML usability, however, so I would
> like to hear counter-arguments.
> Paul Prescod - ISOGEN Consulting Engineer speaking for only himself
> [Woody Allen on Hollywood in "Annie Hall"]
> Annie: "It's so clean down here."
> Woody: "That's because they don't throw their garbage away. They make
> it into television shows."
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