Re: Schema validation using multiple schemas

[Adachi Seiichi]

Bob, Jeff,

Thank you for your replies.

I have 2 questions.

1.  I understand that there may be a need to specify schema#2 in the
xsi:SchemaLocation of the XML file.  However, for a more complex XML
schema, wouldn't this mean that you would have to specify all the
schemas in each XML file?

Yes, this problem can be resolved if you specify the location of schema#2 
in
the XML file.  However, the XML schemas for my application will be more
complex and I do not want to specify all the schemas that are involved.

I am not that familiar with XML but it was my understanding that when
creating an XML file, you do not need to specify the location of all the
schema files that are declared as namespaces inside the XML file, if
they are defined (imported) by the schemas that are specified in the
xsi:schemaLocation of the XML file.  At least, that is what it said in
the 2 XML Schema books I have here. (Sorry, they are in Japanese)
I guess this maybe wrong. To confirm the specification on
<xsi:schemaLocation> and <xsd:import> when using multiple namespaces, I
have been looking at the w3c documents and searching the web, but have
not found a clear answer on this topic.  Is this specified somewhere?

2.  This relates to question#1, but Xerces-J 2.5.0 is able to
resolve the location of imported schema if it is not the root element. 
For example :

test2.xml
---------
<book xmlns='http://foo.com/namespace3'
   xmlns:ns4='http://foo.com/namespace4'
   xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
   xsi:schemaLocation='http://foo.com/namespace3 ns3.xsd'>
      <ns4:chapter>sample XML file</ns4:chapter>
</book>

ns3.xsd
-------
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://foo.com/namespace3"
            xmlns="http://foo.com/namespace3"
            xmlns:ns4="http://foo.com/namespace4"
            elementFormDefault="qualified">

  <xsd:import namespace="http://foo.com/namespace4"
   schemaLocation="ns4.xsd" />

  <xsd:element name="book">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element ref="ns4:chapter"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

</xsd:schema>

ns4.xsd
-------
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://foo.com/namespace4"
            xmlns="http://foo.com/namespace4"
            elementFormDefault="qualified">

  <xsd:element name="chapter" type="xsd:string"/>

</xsd:schema>

Since this file is validated correctly, I had assumed Xerces-J 2.5.0
supports these kind of files.  Is there any possibility that unable to
resolve it in the case of the root element is a bug? (I know they are
implemented differently but just as a note, Xerces-C 2.3.0 did not
return any errors.) Or is this strictly an implementation dependent matter?

Thanks,

Seiichi



>From: "Jeff Greif" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: <[EMAIL PROTECTED]>
>Subject: Re: Schema validation using multiple schemas
>Date: Mon, 25 Aug 2003 06:51:45 -0700
>
>Probably xerces proceeds like this:
>
>Xerces must be able to directly locate the schema for the namespace of the
>root element.  It does not read schema#1 (for a seemingly irrelevant
>namespace) in the hopes of finding the location of schema#2.  If  schema 
#1
>is in the schemaLocation attribute of the instance document, it should 
work.
>You can include both schemas there if you choose.
>
>This is not redundant with the import element in schema#1.  That import is
>required in order to make it legal to refer in schema#1 to items from
>schema#2.
>
>Jeff
>
>
>----- Original Message -----
>From: "Adachi Seiichi" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Monday, August 25, 2003 1:39 AM
>Subject: Schema validation using multiple schemas
>
>
> > Hi All,
> >
> > I am trying to validate an xml file using multiple schema files using
> > Xerces-J 2.5.0.  The xml file specifies the location of schema#1 using
> > schemaLocation.  Inside of schema#1, schema#2 is specified using
> > xsd:import.  I get an error when the root element of the xml file is an
> > element defined in schema#2.
> >
>
>
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