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Hi, Eddie,
Thanks for your suggestion. Do you know if Xerces 1.4 supports Schematron
embedded in W3C schema?
Sean
-----Original Message-----
From: Eddie Robertsson [mailto:eddie@allette.com.au]
Sent: Tuesday, February 05, 2002 6:07 PM
To: Sean Zhang
Cc: xml-dev@lists.xml.org
Subject: Re: [xml-dev] Using <choice> to enforce
rules
Hi Sean,
> I try to use W3C schema to enforce a business rule so that
only one of the
> two attributes can have blank value.
>
> My schema structure is one attribute group with two
attributes which
> requires value, one attribute group with two attributes
which only first
> attribute requires value and one attribute group with same
two attributes
> which only second attribute requires value. Then I have
two groups (element
> groups), first group have the first and second attribute
groups and second
> group have first and third attribute group. Last I create
the element which
> uses a <choice> with reference to the two element groups.
The schema and an
> instance document are below.
>
> I created it in XML Spy 4 and it works as expected. But
when I use Java
> with Xerces 1.4 deployed on Weblogic, it always validates
against the first
> item in the <choice>.
> Can anyone see any problems in my schema design?
Yes. I think XML Spy is wrong here because you the model you
have created is
ambigous. The parser won't know which of the elementA
elements it's parsing. I
think this also violates the constraint the in the same
model group you can't
have two element declarations with the same name but
different types.
Unfortunately W3C XML Schema isn't very good at defining
co-occurence
constraints like this but RELAX-NG and Schematron can do
this or you can choose
to embedd some Schematron rules within your XML Schema to
enforce the extra
constraints. See [1] for an example of how a Schematron rule
can be embedded
within a W3C XML Schema.
Cheers,
/Eddie
[1]
http://lists.w3.org/Archives/Public/xmlschema-dev/2001Nov/0049.html
>
>
> Thanks a lot,
>
> Sean
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified"
attributeFormDefault="unqualified">
> <xs:attributeGroup name="AttGroupA">
> <xs:attribute name="AA">
> <xs:simpleType>
> <xs:restriction
base="xs:string">
> <xs:minLength
value="1"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> <xs:attribute name="BB">
> <xs:simpleType>
> <xs:restriction
base="xs:string">
> <xs:minLength
value="1"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> </xs:attributeGroup>
> <xs:attributeGroup name="AttGroupB">
> <xs:attribute name="CC">
> <xs:simpleType name="">
> <xs:restriction
base="xs:string">
> <xs:maxLength
value="40"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> <xs:attribute name="DD">
> <xs:simpleType name="">
> <xs:restriction
base="xs:string">
> <xs:minLength
value="1"/>
> <xs:maxLength
value="40"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> </xs:attributeGroup>
> <xs:attributeGroup name="AttGroupC">
> <xs:attribute name="CC">
> <xs:simpleType name="">
> <xs:restriction
base="xs:string">
> <xs:minLength
value="1"/>
> <xs:maxLength
value="40"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> <xs:attribute name="DD">
> <xs:simpleType name="">
> <xs:restriction
base="xs:string">
>
> <xs:maxLength
value="40"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> </xs:attributeGroup>
> <xs:group name="ElementGroupA">
> <xs:sequence>
> <xs:element name="ElementA">
> <xs:complexType name="">
>
> <xs:attributeGroup
ref="AttGroupA"/>
> <xs:attributeGroup
ref="AttGroupB"/>
> </xs:complexType>
> </xs:element>
> </xs:sequence>
> </xs:group>
> <xs:group name="ElementGroupB">
> <xs:sequence>
> <xs:element name="ElementA">
> <xs:complexType name="">
>
> <xs:attributeGroup
ref="AttGroupA"/>
> <xs:attributeGroup
ref="AttGroupC"/>
> </xs:complexType>
> </xs:element>
> </xs:sequence>
> </xs:group>
> <xs:element name="TEST">
> <xs:complexType>
> <xs:choice>
> <xs:group
ref="ElementGroupA"/>
> <xs:group
ref="ElementGroupB"/>
> </xs:choice>
> </xs:complexType>
> </xs:element>
> </xs:schema>
>
> <?xml version="1.0" encoding="UTF-8"?>
> <TEST
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:noNamespaceSchemaLocation="D:\Test.xsd">
> <ElementA AA="A" BB="B" CC="" DD=""/>
> </TEST>
>
>
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