RE: restriction against base type (choice - elt)

Hi..

In the table which is in the link
<http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict>
http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict it is given that the
case 

Choice(derived) and elt(base) is forbidden.

Can you please tell me the meaning of this??

Thanks and Regards,
Bharath.


-----Original Message-----
From: George Cristian Bina [ <mailto:george@oxygenxml.com>
mailto:george@oxygenxml.com]
Sent: Tuesday, January 27, 2009 12:35 PM
To: Bharath Kumar Reddy T
Cc: xmlschema-dev@w3.org; ashutosh_p@huawei.com; ranjit@huawei.com
Subject: Re: restriction against base type (choice - elt)

Hi Bharath,

It looks valid to me because the head from the base is treated as a choice
of head, m1 and m2, see

 <http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict>
http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict

2.1 Any top-level element declaration particle (in R or B) which is the
{substitution group affiliation} of one or more other element declarations
and whose .substitution group. contains at least one element declaration
other than itself is treated as if it were a choice group whose {min occurs}
and {max occurs} are those of the particle, and whose {particles} consists
of one particle with {min occurs} and {max occurs} of 1 for each of the
declarations in its .substitution group..

Best Regards,
George
--
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
<http://www.oxygenxml.com> http://www.oxygenxml.com

Bharath Kumar Reddy T wrote:
> Hi..
> 
> According to specification the following schema is invalid since
> according to the table in
>  <http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict>
http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict
> it is given that the case "choice (Derived particle) to element(Base
> Particle) is Forbidden"
> 
> 
> 
> <xs:schema xmlns:xs=" <http://www.w3.org/2001/XMLSchema>
http://www.w3.org/2001/XMLSchema">
> 
> <xs:element name="head"/>
> <xs:element name="m1" substitutionGroup="head"/> <xs:element name="m2"
> substitutionGroup="head"/>
> 
> <xs:complexType name="base">
>  <xs:sequence>
>   <xs:element ref="head"/>
>  </xs:sequence>
> </xs:complexType>
> 
> <xs:complexType name="derived">
>  <xs:complexContent>
>   <xs:restriction base="base">
>    <xs:sequence>
>           <xs:choice>
>              <xs:element ref="m1"/>
>              <xs:element ref="m2"/>
>           </xs:choice>
>    </xs:sequence>
>   </xs:restriction>
>  </xs:complexContent>
> </xs:complexType>
> 
> </xs:schema>
> 
> Can anybody please tell me whether the above schema is valid or
> invalid against the schema spec.
> 
> Thanks and Regards,
> Bharath.
>