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RE: Create XML

• To: "'J.Pietschmann'" <j3322ptm@y...>,"'Robert DiFalco'" <rdifalco@t...>,"'Xml-Dev'" <xml-dev@l...>
• Subject: RE: Create XML
• From: "Martin Soukup" <martin@d...>
• Date: Sat, 14 Jun 2003 08:34:01 -0400
• Importance: Normal
• In-reply-to: <3EEAE3EE.80201@y...>

> -----Original Message-----
> From: J.Pietschmann [mailto:j3322ptm@y...]
> 
> Robert DiFalco wrote:
> > How do most people feel about imposing a sibling element order
> > significance?
> ...
> > However, it seems harder to write parsers that process elements in a
> > random ordering. So often, an arbitrary order is imposed
(presumably) to
> > make parsing easier.
> 
> It is hard to write a DTD with elements which takes a somewhat
> larger number of different child elements in arbitrary order
> but each at most once or exactly once.
> For me, that's enough to introduce an order constraint.

It's not hard, just ugly:

(for each child B, C, D at most once)

<!ELEMENT A
((B)|(C)|(D)|(B,C)|(B,D)|(C,D)|(C,B)|(D,B)|(D,C)|(B,C,D)|(B,D,C)|(C,B,D)
|(C,D,B)|(D,B,C)|(D,C,B)) >

That said, this is enough to make order constraints required rather than
useful, with 20 children this becomes so tedious the errors are almost
guaranteed.

Martin.

• Follow-Ups:
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    • From: "Simon St.Laurent" <simonstl@s...>

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  • Re: Create XML
    • From: "J.Pietschmann" <j3322ptm@y...>

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