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Re: DTDs, W3C Schemas, RELAX NG, Schematron?

• To: John Cowan <jcowan@r...>
• Subject: Re: DTDs, W3C Schemas, RELAX NG, Schematron?
• From: Eddie Robertsson <erobertsson@a...>
• Date: Fri, 24 May 2002 14:28:32 +1000
• Cc: "Bullard, Claude L (Len)" <clbullar@i...>, xml-dev@l...
• References: <200205240339.XAA19934@m...>

> But restrictions by facet are only pre-set ones.  You can restrict
> an integer to be between -5 and +5, but you can't restrict a token,
> say, not to be "foo".  Whereas in RNG that is just xsd:token - "foo".

True.

> > > 11) RNG lists consist of non-whitespace separated by whitespace, and the
> > > non-whitespace need not be all of the same (simple) type.  A pattern like
> > > "list {xsd:integer, xsd:string}+" is perfectly valid, and matches content
> > > like "2 foo 5 bar".
> >
> > This can be done by creating a list type from a union type in XML Schema.
>
> True.  I didn't word this sharply enough.  If you want a list consisting
> of alternating numbers and strings, RNG can do that but XSD can't:
> a list type created from a union type is "list {(xsd:integer|xsd:string}+}",
> and matches things like "2 5 foo bar".

True, although you probably could create something similar by adding a pattern
facet to the list type. For example, the above could be done with:

<xs:simpleType name="List">
  <xs:list>
    <xs:simpleType>
      <xs:union memberTypes="xs:string xs:integer"/>
    </xs:simpleType>
  </xs:list>
</xs:simpleType>

<xs:simpleType name="restrictedList">
  <xs:restriction base="List">
    <xs:pattern value="((\d+ .+) ?)+"/>
  </xs:restriction>
</xs:simpleType>

But for more complex lists this wouldn't work very well and the RELAX-NG way is
much clearer and easier.

Cheers,
/Eddie

• References:
  • Re: DTDs, W3C Schemas, RELAX NG, Schematron?
    • From: John Cowan <jcowan@r...>

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