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   25 Feb Structures Questions

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  • From: Michael Anderson <michael@research.canon.com.au>
  • To: xml <xml-dev@xml.org>
  • Date: Fri, 03 Mar 2000 11:56:22 +1100

Hello all,

I've just done a first pass of the new working draft of XML Schema.  It
certainly is heavy reading, so I hope I haven't missed the answers to my
questions below.

1. When restricting a complex type, it seems (section 4.4.3 Part 1 &
section 3.4 Part 0)  one needs to repeat each particle that is present
in the base type.  I believe this could get messy when there are large
content models.  Especially so as particles listed with different names
to their respective base particle are simply renamed as opposed to in
error.  So if I miss particle 10 in a list of 20 then the last 10
particles will use a base particle that is incorrect and also rename
it.  (Okay, so the total number will raise an error but I'll continue
anyway).  This may not be such a problem if we don't have 20 particles,
which raises my question of how to deal with named Content Model
Groups?  It seems that these need to be expanded in the restricted list,
leading to the large number of particles.  If this is not the case, then
how can one restrict particles hidden within these named groups?

2. Also with restrictions, if attributes of elements are omitted do they
default to the standard default or the values defined in the base type
definition?  Or is it an error to omit attributes previously defined in
the base?

3. In Schema Part 0, Appendix E. Document History, there was mention
that the 16th of Feb draft published had adopted TypeName and
elementName naming convention.  Was this later dropped?


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