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FW: About those "non-deterministic content model" errors

From: Slein, Judith A <JSlein@crt.xerox.com>
Date: Tue, 9 Jan 2001 11:33:48 -0500
Message-ID: <8E3CFBC709A8D21191A400805F15E0DB0211FC05@crte147.wc.eso.mc.xerox.com>
To: "'www-xml-schema-comments@w3.org'" <www-xml-schema-comments@w3.org>
When I sent this note to Henry Thompson, he suggested that I send a comment
to the XML Schema working group.  So here is the example I sent him, and his
response:

<HT>I think I understand the design goal and agree it's reasonable.  The
problem is not with XSV, but with the XML Schema spec. itself.  Given
the example, the relevant element in the instance could be
accepted by either branch of the <choice>, and that's not allowed.

Please send this example to www-xml-schema-comments and prefix it with 
the observation that without a version of 'any' which explicitly does 
_not_ validate anything which would cause a violation of the unique
attribution restriction you can't do what you (quite reasonably) want
to do.</HT>

-----Original Message-----
From: Slein, Judith A 
Sent: Monday, January 08, 2001 9:47 AM
To: 'ht@cogsci.ed.ac.uk'
Subject: About those "non-deterministic content model" errors


These errors have been causing me no end of headaches, and it seems to me
XSV should be able to figure out what to do.

I'm in the situation of having to implement the JDF spec, which is being
developed by a printing industry consortium.  The JDF spec does not include
an XML Schema yet, but it seems relatively easy to figure out from their
models what the schema will look like, so I've taken a stab a writing one.
The spec forbids the use of derived types for extensions except in the case
of "private extensions".  So I'm assuming they will put "any" and
"anyAttribute" at all the extension points.  However, we would like to use
derived types in spite of their prohibition, and just say that we are
defining private extensions.  So you get definitions like:

<element name="ResourcePool" type="jdf:ResourcePool"/>
<complexType name="ResourcePool">
   <complexContent>
      <extension base="jdf:GenericContent">
         <choice minOccurs="0" maxOccurs="unbounded">
            <element ref="jdf:Resource"/>
<!-- Extension resources are allowed.  They must have the structure of
     JDF resources, but JDF doesn't allow the use of derived types
     to define them.  We will use derived types anyhow, but to be prepared
     for non-derived resources from 3rd parties . . . -->
            <any namespace="##other" processContents="lax"/>
         </choice>
      </extension>
   </complexContent>
</complexType>

Then we define in our namespace new types derived from Resource.  Using our
derived types in an instance document then causes the "non-deterministic
content model" schema error.  But since we declare the substitutionGroup of
our elements to be "jdf:Resource", it seems to me that a schema validator
should try to use the more restrictive validation path.  That is, it could
have a rule that says, if you can validate this without resorting to "any",
do so. Otherwise, use "any".

What do you think?

--Judy



-----Original Message-----
From: ht@cogsci.ed.ac.uk [mailto:ht@cogsci.ed.ac.uk]
Sent: Friday, January 05, 2001 4:51 PM
To: Slein, Judith A
Cc: 'xmlschema-dev@w3.org'
Subject: Re: False "undefined type" error from XSV


Can't reproduce with the current version, sorry.  Try upgrading to
XSV11.EXE, and try again.

Here are the error messages I get from the current version:

<schemaError char='55' line='371' phase='instance'
resource='file:///projects/lt
g/users/ht/xml/xmlschema/monk/slein/JDF.xsd'>non-deterministic content 
model for
 type ResourcePool: {Wildcard:
##other}/{http://www.xerox.com/xmlschemas/DigiFin
ish}:BindingIntent</schemaError>
<schemaWarning char='31' line='99' phase='instance'
resource='file:///projects/l
tg/users/ht/xml/xmlschema/monk/slein/JDF.xsd'>restricting a list with
facets not
 implemented yet</schemaWarning>
<schemaWarning char='31' line='99' phase='instance'
resource='file:///projects/l
tg/users/ht/xml/xmlschema/monk/slein/JDF.xsd'>restricting a list with
facets not
 implemented yet</schemaWarning>
<schemaWarning char='31' line='99' phase='instance'
resource='file:///projects/l
tg/users/ht/xml/xmlschema/monk/slein/JDF.xsd'>restricting a list with
facets not
 implemented yet</schemaWarning>
<schemaError char='63' line='532' phase='instance'
resource='file:///projects/lt
g/users/ht/xml/xmlschema/monk/slein/JDF.xsd'>non-deterministic content 
model for
 type ResourceLinkPool: {Wildcard:
##other}/{http://www.xerox.com/xmlschemas/Dig
iFinish}:VerificationIntentLink</schemaError>

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
Received on Tuesday, 9 January 2001 11:33:30 GMT

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