this is a little offtopic, or maybe not.
so if i wanted to validate an alternating sequence of elements of
unbounded length, how would i describe it?
so, A,AB,ABA,ABAB,... etc are legal
but B,BA, AA, BB, ABB, etc are not.
this was the first implementation, but it violates UPA as far as xerces-j
2.0.0 is concerned:
<sequence>
<element name="A" type="string"/>
<sequence minOccurs="0" maxOccurs="unbounded">
<element name="B" type="string"/>
<element name="A" type="string"/>
</sequence>
<element name="B" type="string" minOccurs="0"/>
</sequence>
among other things. i was thinking that this was a recursion problem and
this was what i came up with after google-mining for recursion and
XMLSchema:
http://castor.exolab.org/list-archive/msg08774.html
this was my distilled contribution, but it's not correct because it would
permit AA:
<element name="AB-list-ref">
<complexType>
<sequence>
<element ref="AB-list"/>
<sequence>
<complexType>
<element>
<element name="AB-list">
<complexType>
<sequence>
<element name="A" type="string"/>
<choice>
<element name="B" type="string"/>
<element ref="AB-list-ref" minOccurs="0"/>
<choice>
<sequence>
<complexType>
<element>
so, mine is wrong. and i have been beating the heck out of this and not
getting anywhere.
if somebody knows of a canonical example of such a thing, i'd really like
to see it. if anybody has implemented something that sorta works, i'd love
to see that too!
one thing that has occurred to me as a sortof nifty tool: a way to express
regexps as XMLSchema:
ie, enter a regexp and get back a correct XMLSchema for same.
anybody ever seen such a beasty?
tnx for any help that anyone can provide!
johnu
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