Problem with ref-attributes and schema validation 2007-06-17 - By Asgeir Frimannsson
Hi Michael,
Thanks for this clarification.
cheers,
asgeir
On 6/18/07, Michael Glavassevich <mrglavas@(protected)> wrote:
> Hi Asgeir,
>
> What you're observing is normal. The prefixes used in schema documents
> don't get carried over into the schema component model [1] or defaulted
> attributes [2] (just the local name and namespace URI). Note that
> sax.Writer is just a sample for users to learn how to use SAX. It doesn't
> do everything a real namespace-aware serializer should do like namespace
> fixup: selecting suitable prefixes for elements/attributes and adding the
> necessary namespace declarations to the document to make it well-formed.
>
> Thanks.
>
> [1] http://www.w3.org/TR/xmlschema-1/#Attribute_Declaration_details
> [2] http://www.w3.org/TR/xmlschema-1/#d0e8328
>
> Michael Glavassevich
> XML Parser Development
> IBM Toronto Lab
> E-mail: mrglavas@(protected)
> E-mail: mrglavas@(protected)
>
> "Asgeir Frimannsson" <asgeirf@(protected)> wrote on 06/14/2007 07:39:47 AM:
>
> > Hi all,
> >
> > I have come across something that _might_ be a bug in xerces. Let me
> > explain by example:
> >
> > Given the following schema:
> >
> > <xsd:schema
> > xmlns:xsd="http://www.w3.org/2001/XMLSchema"
> > xmlns:xml="http://www.w3.org/XML/1998/namespace"
> > elementFormDefault="qualified"
> > targetNamespace="http://www.example.com">
> >
> > <!-- Import for xml:space -->
> > <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
> > schemaLocation="http://www.w3.org/2001/xml.xsd"/>
> >
> > <xsd:element name="animal">
> > <xsd:complexType mixed="true">
> > <xsd:attribute ref="xml:space" default="preserve"/>
> > <xsd:attribute name="name" type="xsd:string" use="required"/>
> > </xsd:complexType>
> > </xsd:element>
> >
> > </xsd:schema>
> >
> > Notice the xml:space attribute has a default value 'preserve'. Now,
> > given the following instance:
> >
> > <?xml version="1.0" encoding="utf-8"?>
> > <animal xmlns="http://www.example.com" xmlns:x="http://www.example.com"
> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> > xsi:schemaLocation="http://www.example.com SpaceBug.xsd"
> > name="dog">
> > hi, i'm a dog
> > </animal>
> >
> > Note that no value is set for xml:space, so I expect xerces to insert
> > this for me when doing schema validation. To make the possible bug
> > simple to reproduce, I'll use one of the xerces samples for validating
> > and writing this document. Using the following options:
> > Namespace processing: on
> > Namespace prefixes: on
> > Validation: on
> > Schema validation support: on
> > Schema full checking: on
> >
> > java sax.Writer -n -np -s -f -v instance.xml
> >
> > ...which produces the following output:
> >
> > <animal name="dog" space="preserve" xmlns="http://www.example.com"
> > xmlns:x="http://www.example.com"
> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> > xsi:schemaLocation="http://www.example.com SpaceBug.xsd">
> > hi, i'm a dog
> > </animal>
> >
> > Notice how the xml:space attribute is now unqualified. This is
> > reproducable for any namespace, not just the special xml namespace.
> >
> > I initially bumped into this problem when using the XOM library
> > (reported [1]), and it seems that the namespace uri is correctly set
> > when inserting the default value, but the prefix is lost.
> >
> > cheers,
> > asgeir
> >
> > [1]
> http://lists.ibiblio.org/pipermail/xom-interest/2007-June/003484.html
> >
> > --
> > Asgeir Frimannsson
> > PhD Candidate
> > School of Software Engineering and Data Communications
> > Queensland University of Technology
> > 126 Margaret Street, Level 3
> > Brisbane QLD 4001, Australia
> >
> > Phone: (+61) 7 3138 9332 Mob: (+61) 405 412 696
> > Email: asgeirf@(protected)
> >
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--
Asgeir Frimannsson
PhD Candidate
School of Software Engineering and Data Communications
Queensland University of Technology
126 Margaret Street, Level 3
Brisbane QLD 4001, Australia
Phone: (+61) 7 3138 9332 Mob: (+61) 405 412 696
Email: asgeirf@(protected)
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