Choosing between 2 <xsd:all > choices in an xml schema 2003-01-22 - By khalm
Hi Dennis
Your Schema isn't valid because the all group can only appear as "top
level" group and in your Schema the all group is part of the choice
group (and of course your example Schema isn't well formed :) ).
A (hopefully) valid Schema would look like this:
........
<xsd:complexType name="blub">
<xsd:sequence>
<xsd:element name="A" type="xsd:string"/>
<xsd:choice>
<xsd:sequence>
<xsd:element name="B" type="xsd:string"/>
<xsd:element name="D" type="xsd:string"/>
</xsd:sequence>
<xsd:sequence>
<xsd:element name="C" type="xsd:string"/>
<xsd:element name="E" type="xsd:string"/>
</xsd:sequence>
</xsd:choice>
</xsd:sequence>
</xsd:complexType>
......
by adding minOccurs="0" to the element declaration you can make the
elements optional. The only restriction you have, is the fixed order of
element appearances: first element A then B then D (or A C E). As far as
I know there is no possibility to implement an arbitrary order in this case.
Cheers
Kristian
Denis McCarthy wrote:
>Hi there,
>I'm parsing a document using dom, and I want to enforce certain rules using
>a schema.
>Say there are 4 xml tags that I want to set rules for, <A>, <B>, <C>, <D>
>and <E>.
>I want to set up a rule where a combination of (say) <A>,<B> and <D>
>appearing in a message are valid, and also
>(say) <A>, <C> and <E>, but no other combination is valid. I would have
>thought that something like
><xsd:choice>
><xsd:all>
><xsd:element name=<A>
><xsd:element name=<B>
><xsd:element name=<D>
></xsd:all>
><xsd:all>
><xsd:element name=<A>
><xsd:element name=<C>
><xsd:element name=<E>
></xsd:all>
></xsd:choice>
>would be the way to do it, but apparently this is an error (I get the
>following when I parse my Document)
>
>Error: choice content must be zero or more of element, group, choice,
>sequence or any. Saw "{1}".
>
>Does anyone know of a way I can enforce this type of rule? Thanks
>Denis McCarthy
>
>
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