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RE: Non-native attributes

From: Priscilla Walmsley <priscilla@walmsley.com>
Date: Wed, 10 Jul 2002 13:50:24 -0400
To: "'Sal Mangano'" <sal.mangano@morganstanley.com>, <xmlschema-dev@w3.org>, "'Bob Schloss'" <rschloss@us.ibm.com>
Message-ID: <008401c2283a$45666d70$339afea9@WALMSLEYPH>
Hi Sal, 
The problem is that in your main schema you have the instance namespace
misspelled (XMLScheam instead of XMLSchema).
After fixing this your example works just fine in XSV and Xerces 2.0.1.
Unfortunately, though, neither tool checks that the value of the joindef
attribute is a valid boolean - XSV because it does not do all validation
of simple types (it _will_ raise appropriate errors if joindef is
declared as xs:integer), and Xerces apparently because it does not
consult the other schema.  
I'm not sure why XML Spy gives you that message but you might try taking
the schemaLocation attribute out of the main schema.  Since you won't be
able to validate the value of joindef with available tools anyway, it is
not accomplishing anything.  
Bob, he is trying to validate a non-native attribute that he is using on
the element element, not an attribute he is using in a complex type
definition (one meta level away), so import is not necessary here.   
Priscilla Walmsley             priscilla@walmsley.com
Author, Definitive XML Schema     (Prentice Hall PTR)

-----Original Message-----
From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org]
On Behalf Of Sal Mangano
Sent: Wednesday, July 10, 2002 1:14 PM
To: xmlschema-dev@w3.org; Bob Schloss
Subject: Re: Non-native attributes

Thanks. I derived this from an example in "Definitive XML Schema" by P.
Welmsey p.103. Either I read it wrong or the example is in error.

----- Original Message ----- 
From: Bob  <mailto:rschloss@us.ibm.com> Schloss 
To: Sal Mangano <mailto:sal.mangano@morganstanley.com>  ;
Sent: Wednesday, July 10, 2002 12:06 PM
Subject: Re: Non-native attributes

If a non-native attribute is an attribute declare in a different
targetNamespace, then normally you would include in the using schema an
import element information item. 

Something like
<xs:import namespace="http://www.morganstanley.com/fid/db"
although the schemaLocation is technically optional.

I can see that you may not be completely clear about namespace and
incorporated document handling in schema, because the xsi:schemaLocation
attribute which you have on your schema element makes no sense. All the
attribute in the xsi: namespace are intended to be used in instance
documents, not in schemas. 

Note that a good schema diagnostic tool (and one I contributed to) is
the IBM XML Schema Quality Checker. You can download it from
http://www.alphaworks.ibm.com/tech/xmlsqc . It often finds subtle errors
not found by XMLSpy, and sometimes suggests the appropriate change to
your schema.

Another good tool is XSV. A complete list of tools is at
http://www.w3.org/XML/Schema .

Bob Schloss
IBM T. J. Watson Research Center
Hawthorne, NY, USA

Sent by: xmlschema-dev-request@w3.org 

To: <xmlschema-dev@w3.org>
Subject: Non-native attributes

I am designing a XSD schema in XML Spy v4.4 that uses a non-native
attribute. XML Spy is complaining that the schema that defines my
has "no content model". Am I doing something wrong or is this the tools
problem. See below.

This is my main scheama:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 



<xs:element name="SwapMain">

	<xs:documentation>The main Swap Table in the
<xs:element name="SName" type="xs:string" db:joindef="true"/>
<xs:element name="SStatus"/>

<!-- Lots more irrelevant stuff here ...-->



	<!-- Lots more irrelevant stuff here ...-->


This is the schema defining the non-native attribute:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.morganstanley.com/fid/db"
<xs:attribute name="joindef" type="xs:boolean">
<xs:documentation>Attach this attribute to fields that define the
collection of all data that are decendants of the
Received on Wednesday, 10 July 2002 13:52:37 UTC

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