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RE: question about group circle definition

From: Michael Kay <mike@saxonica.com>
Date: Thu, 8 Mar 2007 08:37:50 -0000
To: "'Wang, Zhuo'" <zhuo.wang@intel.com>, <xmlschema-dev@w3.org>
Cc: "'Moog, Thomas H'" <thomas.h.moog@intel.com>
Message-ID: <006501c7615d$0ebc6930$6401a8c0@turtle>
Could you give the name of the test case please?
 
Michael Kay
http://www.saxonica.com/


  _____  

From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On
Behalf Of Wang, Zhuo
Sent: 08 March 2007 01:31
To: xmlschema-dev@w3.org
Cc: Moog, Thomas H
Subject: question about group circle definition 



Hi All, 

 

I meet a case in w3c test suite: 

 

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

 

    <xsd:complexType name="a">

        <xsd:sequence>

            <xsd:group ref="ul" minOccurs="0" maxOccurs="unbounded"/> 

        </xsd:sequence>

    </xsd:complexType> 

 

    <xsd:group name="ul">

        <xsd:sequence>

            <xsd:element name="ul">

                <xsd:complexType>

                    <xsd:sequence>

                        <xsd:choice minOccurs="0" maxOccurs="unbounded">

                            <xsd:element name="li" /> 

                            <xsd:group ref="ul" minOccurs="0"
maxOccurs="unbounded" /> 

                        </xsd:choice>

                    </xsd:sequence>

                </xsd:complexType>

            </xsd:element>

        </xsd:sequence>

    </xsd:group>

 

</xsd:schema>

 

I think this case voilate:

3.8.6 Constraints on Model Group Schema Components

All model groups (see Model Groups (3.8)) must satisfy the following

constraints.

 

Schema Component Constraint: Model Group Correct

All of the following must be true:

2 Circular groups are disallowed. That is, within the {particles} of a group

there must not be at any depth a particle whose {term} is the group itself.

 

However, many schema validators say it is a valid case. 

Somebody knows the reason? 

 

Thanks, 

- Wang Zhuo    

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Received on Thursday, 8 March 2007 08:38:09 UTC

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