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RE: Adam Bosworth on XML and W3C
- From: "Bullard, Claude L (Len)" <clbullar@i...>
- To: "Fuchs, Matthew" <matthew.fuchs@c...>, xml-dev@l...
- Date: Tue, 09 Oct 2001 13:00:19 -0500
Title: RE: Adam Bosworth on XML and W3C
So
cognitive loading or psychological complexity is the measure of choice and it
depends on a view so is suspect
unless
the view is generalizable as well.
I like
the n-dimensional approach. Nice fat strange
attractors....
len
I can see two ways to look at this.
If you consider each specification as describing a language -
the language of all correct schemas in the first case, and the language of all
correct HTML4 pages in the latter - then one could apply algorithmic
information theory (developed by Chaitin and Kolmogorov in the '60's) and
state that the complexity of a specification is the length of the minimum
program required to verify that a statement (a schema in the first case, an
HTML4 page in the latter) is in the language described by the
specification. From that perspective, HTML4 probably is simpler than
Schema, given all the weird edge cases in Schema.
But that wouldn't really be fair - validating an HTML4 page
isn't a very useful task. On the schema side, a better measure might be
the minimum size of a program that, given a Schema and an instance, generates
the PSVI. On the HTML4 side, a better measure would be the minimum size
of a program that, given an HTML4 page, displays the page in a browser.
This probably skews the results back towards making Schema simpler. On
the other hand, judging HTML4 depends so much on the UI it is implemented on
that it makes judging the complexity of an implementation very
difficult.
But then one might argue that this is not the relevant measure
of complexity - we're not looking for the minimum size across all programs,
but we're looking for a very different measure of complexity - the number of
synaptic changes in a human brain required to achieve competence in one or the
other.
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