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validation issue for extensible schema - XMLSpy issue ?

From: Laurent Le Meur <laurent.lemeur@afp.com>
Date: Fri, 14 Feb 2003 13:22:45 +0100
To: <xmlschema-dev@w3.org>, "newsml" <newsml@yahoogroups.com>
Message-ID: <006801c2d423$c7597df0$2687329e@par.afp.com>

Hi, 

I'm looking for a way to create an extensible schema, that can act as a
container for any structure, but with the capability to validate xml
instances against the container schema AND the payload schema. 

My parser is XMLSpy5 rel3, and I reach bizarre conclusions.

the container schema : a.xsd
-----------------------------
A simple test schema : a can contain anything ; unqualified elements.
Use the <any> element with processContents="strict", the only option
that provoques validation of the inner structure with XMLSpy.

<xsd:schema xmlns="urn:newsml:iptc.org:a"
targetNamespace="urn:newsml:iptc.org:a"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" version="1.0">
	<xsd:element name="a">
		<xsd:complexType>
			<xsd:complexContent>
				<xsd:restriction base="xsd:anyType">
					<xsd:sequence>
						<xsd:any
namespace="##other" processContents="strict" minOccurs="0"
maxOccurs="unbounded"/>
					</xsd:sequence>
				</xsd:restriction>
			</xsd:complexContent>
		</xsd:complexType>
	</xsd:element>
</xsd:schema>

the payload schema : b.xsd
---------------------------
A simple test schema : b can contain bb* (string) ; unqualified elements

<xsd:schema targetNamespace="urn:newsml:iptc.org:b"
xmlns="urn:newsml:iptc.org:b"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" version="1.0">
	<xsd:element name="b">
		<xsd:complexType>
			<xsd:sequence>
				<xsd:element ref="bb" minOccurs="0"
maxOccurs="unbounded"/>
			</xsd:sequence>
		</xsd:complexType>
	</xsd:element>
	<xsd:element name="bb" type="xsd:string"/>
</xsd:schema>

first tests
-------------
Instance1 is valid (fine):
<a xmlns="urn:newsml:iptc.org:a"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="urn:newsml:iptc.org:a  a.xsd   urn:newsml:iptc.org:b
b.xsd ">
	<b xmlns="urn:newsml:iptc.org:b" ><bb>ffff</bb></b>
</a>

Instance2, with a 'c' element, is invalid (so far so good ; at least
I've got what I wanted):
<a xmlns="urn:newsml:iptc.org:a"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="urn:newsml:iptc.org:a  a.xsd   urn:newsml:iptc.org:b
b.xsd ">
	<b xmlns="urn:newsml:iptc.org:b" ><bb>ffff</bb><c/></b>
</a>

Now the issues
---------------
Instance3 is invalid (I just reversed 'a' and 'b' schemaLocation
information ; ????):
<a xmlns="urn:newsml:iptc.org:a"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="urn:newsml:iptc.org:b  b.xsd  urn:newsml:iptc.org:a
a.xsd">
	<b xmlns="urn:newsml:iptc.org:b" ><bb>ffff</bb><c/></b>
</a>

Instance4 is valid (I entered a false URL for the 'b' namespace, the
validator should say no!; same result if I suppress the 'b' information
in schemaLocation ; ????):
<a xmlns="urn:newsml:iptc.org:a"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="urn:newsml:iptc.org:a  a.xsd  urn:newsml:iptc.org:b
c.xsd  ">
	<b xmlns="urn:newsml:iptc.org:b" ><bb>ffff</bb><c/></b>
</a>

I tend to believe that XMLSpy uses the 'strict' processContents option
in 'a' as a 'lax' option, and the 'lax' option as a 'skip' option.

Does anybody has seen such problems in "real life", with other
validating parser ?


Laurent Le Meur
Agence France Presse
Member of IPTC (www.iptc.org) - creators of NewsML: the XML news wrapper
Received on Friday, 14 February 2003 08:31:23 GMT

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