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I will try an overviewish explanation of Bob's observation..
XSD relies very strongly on top-down validation. So I think what Bob
experiences will happen.
RNG is based on regular tree languages, where bottom-up validation is as
well-known as top-down validation. So RNG, irrespective of the
implementation, would require such features.
best regards,
murali.
On Fri, 12 Sep 2003, DuCharme, Bob (LNG-CHO) wrote:
> >Subscribe by email to xmlschema-dev-request@w3.org
>
> Well, as long as we've got the thread going here...
>
> >Lax processing is recursive, so the non-beta
> >children of alpha will be laxly validated as well, unto the n-th
> >generation.
>
> Then why was the word "children" used in the quoted passage ("...or any
> items among its [children]")instead of "descendants"?
>
> My experience seems to bear out what Dare says. Here's my schema:
>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
>
> <xs:element name="alpha">
> <xs:complexType>
> <xs:sequence>
> <xs:any processContents="lax" maxOccurs="unbounded"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
>
> <xs:element name="beta">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="c" type="xs:string"/>
> <xs:element name="d" type="xs:string"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
>
> </xs:schema>
>
> Xerces C++ reports errors for the third beta element below, but not the
> second:
>
> <alpha xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:noNamespaceSchemaLocation="alpha.xsd">
> <beta><c/><d/></beta> <!-- matches beta content model -->
> <e/>
> <f>
> <beta><x/></beta> <!-- doesn't, but grandchild of alpha -->
> </f>
> <beta><y/></beta> <!-- doesn't -->
> </alpha>
>
> In the absence of the kinds of declarations described by Jeni for other
> potential parents of beta, descendants of the processContents="lax"
> element's children seem to be processed as if those children had a
> processContents value of "skip". Otherwise, the x element in the second beta
> element would have triggered an error, right?
>
> My basic goal is this: to write a schema that accepts everything in a
> well-formed document except those elements specifically declared in that
> schema, wherever they may turn up in the document. It's not looking
> encouraging in XSD, although I have managed it in RNG.
>
> Bob
>
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