- From: Bob Schloss <rschloss@us.ibm.com>
- Date: Wed, 4 Feb 2004 11:53:19 -0500
- To: Hess Yvan <yvan.hess@imtf.ch>
- Cc: "'xmlschema-dev@w3.org'" <xmlschema-dev@w3.org>
Hess,
The first content model permits
<document/>
<document><A>..</A></document>
<document><B>..</B></document>
<document><C>..</C></docuemnt>
<document><A>..</A><A>..</A></document>
<document><A>..</A><B>..</B></document>
<document><A>..</A><C>..</C></document>
<document><B>..</B><B>..</B></document>
<document><B>..</B><C>..</C></document>
<document><B>..</B><A>..</A></document>
<document><C>..</C><A>..</A></document>
<document><C>..</C><B>..</B></document>
<document><C>..</C><C>..</C></document>
corresponding to occurs of 0, 1 and 2 for the choice particle.
The middle content model permits
<document/> where every inner occurs is 0
<document><A>..</A></document>
<document><B>..</B></document>
<document><C>..</C><document>
where the outer occurs is 1 and the inner occurs is 1
<document>any sequence of multiple A,B,C tags whatsoever</document>
where the outer occurs is > 1 and the inner occurs is sometimes 0 and
sometimes 1
Your last content model permits
<document/>
where outer occurs was 1 and choice went to element B or element C with
occurs of 0
<document><A>,,</A></document>
<document><B>..</B></document>
<document><B>..</B><B>..</B></document>
<document><B>..</B><B>..</B><B>..</B></document>
<document><C>..</C></document>
where outer occurs was 1
any valid concatentation of the content patterns shown above is permitted,
where occurs > 1
Good luck,
Bob
XML/XSL Transformational Systems - Extensible Technologies
IBM Thomas J Watson Research Center
Yorktown Heights, New York, USA
Hess Yvan
<yvan.hess@imtf.c
h> To
Sent by: "'xmlschema-dev@w3.org'"
xmlschema-dev-req <xmlschema-dev@w3.org>
uest@w3.org cc
Subject
02/04/2004 11:17 Intepretation of choice compositor
AM and occurence into xml schema
It is not clear for me how to interpet attribute elements
minOccurs/maxOccurs into <choice> element having sub-elements that also
have
minOccurs/maxOccurs attributes as for example
Schema 1:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="document">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="2">
<xs:element name="A" minOccurs="1" maxOccurs="1"/>
<xs:element name="B" minOccurs="1" maxOccurs="1" />
<xs:element name="C" minOccurs="1" maxOccurs="1"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>
Schema 2:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="document">
<xs:complexType>
<xs:choice minOccurs="1" maxOccurs="unbounded">
<xs:element name="A" minOccurs="0" maxOccurs="1"/>
<xs:element name="B" minOccurs="0" maxOccurs="1" />
<xs:element name="C" minOccurs="0" maxOccurs="1"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>
Schema 3:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="document">
<xs:complexType>
<xs:choice minOccurs="1" maxOccurs="unbounded">
<xs:element name="A" minOccurs="1" maxOccurs="1"/>
<xs:element name="B" minOccurs="0" maxOccurs="3" />
<xs:element name="C" minOccurs="0" maxOccurs="1"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>
I tried to find more information about this subject on the web, but I
didn't
succeed.
Can somebody give me more information about how to interpret schema 1,
schema 2 and schema 3 ?
Thanks for your help.
Yvan
Received on Wednesday, 4 February 2004 11:53:59 UTC