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(Deleted User) Subject: Namespaces and Validation (XML Schema)
Author: (Deleted User)
Date: 12 Sep 2001 08:20 AM
Stylus Studio 3.1 Beta, build 59a
I've got a couple of problems with the attached files. Sample.xml is the data document. sigraph.xsd and xlink.xsd are the associated XML Schemas.

Problems:

1) The file sigraph.xsd fails validation with:

file://sigraph.xsd:3,265: Attribute '{http://www.w3.org/2000/xmlns/}sig' is not declared for element 'xsd:schema'
file://sigraph.xsd:3,265: Attribute '{http://www.w3.org/2000/xmlns/}xlink' is not declared for element 'xsd:schema'

2) sample.xml does not validate at all

it seems the XML Schema is not found or used. The errors start with file://sample.xml:4,14: Unknown element 'SIGRAPH'
file://sample.xml:4,14: Root element different from DOCTYPE

3) When sigrpah.xsd is used as source for an XML to XML Mapping only a few elements are shown (SIGRAPH, HEADER, OBJECTS, RELATIONSHIPS, DATASETS).

All the remaining elements (children of the above) are not shown in the treeview as source for mappings. Is the schema too complex?


Applicationxlink.xsd


Documentsigraph.xsd


Documentsample.xml

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(Deleted User) Subject: Namespaces and Validation (XML Schema)
Author: (Deleted User)
Date: 12 Sep 2001 08:31 AM
I forgot a fourth problem. When querying the sample.xml with e.g. /SIGRAPH the results are empty. Seems to stem from the fact that I use a default namespace. What would be the proper syntax for such a query?

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Alberto MassariSubject: Re: Namespaces and Validation (XML Schema)
Author: Alberto Massari
Date: 12 Sep 2001 08:54 AM
At 08.38 12/09/2001 -0400, you wrote:
>From: "Thomas Steinborn"
>
>I forgot a fourth problem. When querying the sample.xml with e.g. /SIGRAPH
>the results are empty. Seems to stem from the fact that I use a default
>namespace. What would be the proper syntax for such a query?

Unfortunately you cannot currently use the XPath query facility to query an
XML using a default namespace, due to limitations imposed by the XPath/XSLT
interaction. You need to define a namespace prefix for the default
namespace and use it in the XPath query string (i.e. add a
xmlns:hlp="http://www.sigraph.de/schemas/7.1" to the root node and change
the query into /hlp:SIGRAPH)

Alberto

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(Deleted User) Subject: Re: Namespaces and Validation (XML Schema)
Author: (Deleted User)
Date: 12 Sep 2001 09:21 AM
Alberto,

thanks for the catch with the old URI and the workaround for the query.

What about the 3rd question about the mapper showing only a limited set of elements. Is this due to the limitations of xerces 1.5.1 as well?

Thanks
Thomas

Postnext
Minollo I.Subject: Re: Namespaces and Validation (XML Schema)
Author: Minollo I.
Date: 12 Sep 2001 09:31 AM

>...
>What about the 3rd question about the mapper showing only a limited set of
>elements. Is this due to the limitations of xerces 1.5.1 as well?

Thomas,
we are looking into it; this one looks like a bug.

Thanks,
Minollo

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Alberto MassariSubject: Re: Namespaces and Validation (XML Schema)
Author: Alberto Massari
Date: 12 Sep 2001 08:49 AM
Hi Thomas,

At 08.27 12/09/2001 -0400, you wrote:
>[..]
>1) The file sigraph.xsd fails validation with:
>
>file://sigraph.xsd:3,265: Attribute '{http://www.w3.org/2000/xmlns/}sig'
>is not declared for element 'xsd:schema'
>file://sigraph.xsd:3,265: Attribute '{http://www.w3.org/2000/xmlns/}xlink'
>is not declared for element 'xsd:schema'

This is a known limitation of the 'validate XMLSchema' functionality; we
are using the DTD representation of the XMLSchema spec, and DTD validation
will flag as an error every attribute or element non specified in the DTD
itself, even if they are in their own namespace.

>2) sample.xml does not validate at all
>
>it seems the XML Schema is not found or used. The errors start with
>file://sample.xml:4,14: Unknown element 'SIGRAPH'
>file://sample.xml:4,14: Root element different from DOCTYPE

The XMLSchema is not found because you are using an old URI for the
XMLSchema-instance namespace: the one you use comes from the October
working draft while you should use the URI specified in the recommendation
("http://www.w3.org/2001/XMLSchema-instance")
When you change this, you will see that validation occurs, even if the
XMLSchema you are using does contain XMLSchema features that Xerces 1.5.1
still doesn't support (like anyURI, dateTime, double, etc...)

Alberto

 
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