W3C home > Mailing lists > Public > www-ws-desc@w3.org > January 2004

Re: Issue: properties and schema languages other than XSD

From: Jean-Jacques Moreau <jean-jacques.moreau@crf.canon.fr>
Date: Thu, 08 Jan 2004 17:26:42 +0100
Message-ID: <3FFD84C2.5080104@crf.canon.fr>
To: Jeffrey Schlimmer <jeffsch@windows.microsoft.com>
Cc: Roberto Chinnici <Roberto.Chinnici@Sun.COM>, www-ws-desc@w3.org

Sounds good to me too.

Jean-Jacques.

Jeffrey Schlimmer wrote:

> +1, if we keep features and properties
> 
> 
>>-----Original Message-----
>>From: www-ws-desc-request@w3.org [mailto:www-ws-desc-request@w3.org]
> 
> On
> 
>>Behalf Of Roberto Chinnici
>>Sent: Monday, January 05, 2004 4:24 PM
>>To: www-ws-desc@w3.org
>>Subject: Issue: properties and schema languages other than XSD
>>
>>
>>It appears that the definition of the property component in WSDL 2.0
>>([1]) does not allow the use of schema languages other than XML
> 
> Schema.
> 
>>A quick comparison with, e.g., the message reference component ([2])
>>will illustrate the issue.
>>
>>The {message} property of a message reference component is defined as
>>follows:
>>
>>   {message} 	The element declaration resolved to by the value of the
>>   message attribute information item if present, otherwise a similar
>>   construct in some type system as referred to by some other
> 
> attribute
> 
>>   information item if present, otherwise empty.
>>
>>So in
>>
>>  <input messageReference="xs:NCName"?
>>         message="xs:QName"? >
>>         <documentation />?
>>  </input>
>>
>>the "message" attribute is optional and it can be replaced with a
>>different one (via extensibility).
>>
>>On the other hand, the {value constraint} property of a property
>>component has this definition:
>>
>>   {value constraint} 	If the constraint element information
> 
> item is
> 
>>   present, the type referred to by the value of this element
> 
> information
> 
>>   item. Otherwise, if the value element information item is present,
> 
> an
> 
>>   anonymous simple type, whose base type is "xs:anySimpleType", with
> 
> a
> 
>>   single "enumeration" facet whose value is that of the element
>>   information item. Otherwise, "xs:anySimpleType".
>>
>>No mention of non-XML Schema type systems here. Moreover, in
>>
>>   <property
>>       uri="xs:QName"
>>       required="xs:boolean"? >
>>     <documentation />?
>>     [ <value /> | <constraint /> ]
>>   </property>
>>
>>one of <value/> or <constraint/> is REQUIRED. How would someone
> 
> specify
> 
>>a constraint using a schema language other then XML Schema then?
>>
>>A possible solution is to change the syntax for <wsdl:property/> to:
>>
>>   <property
>>       uri="xs:QName"
>>       required="xs:boolean"?
>>       value="xs:anySimpleType"?
>>       constraint="xs:QName"? >
>>     <documentation />?
>>   </property>
>>
>>Then the {value constraint} property would be defined as follows:
>>
>>   - if the value attribute information item is present, an anonymous
>>simple type, whose base type is "xs:anySimpleType", with a single
>>"enumeration" facet whose value is that of the attribute information
>>item;
>>   -  otherwise, if the constraint attribute information item is
> 
> present,
> 
>>the type referred to by the value of this attribute information item;
>>(incidentally, I think here we should say "the *simple* type
> 
> definition
> 
>>referred to by...")
>>   - otherwise a similar construct in some type system as referred to
> 
> by
> 
>>some other attribute information item if present,
>>   - otherwise the simple type definition for xs:anySimpleType
>>
>>I cannot quite recall why we decided to use element information items
>>for <value/> and <constraint/> instead of attributes. Perhaps somebody
>>will help me remember...
>>
>>Happy New Year!
>>
>>Roberto
>>
>>--
>>Roberto Chinnici
>>Java Web Services
>>Sun Microsystems, Inc.
>>roberto.chinnici@sun.com
>>
>>[1] http://www.w3.org/TR/wsdl20/#Property
>>[2] http://www.w3.org/TR/wsdl20/#MessageReference
> 
> 
Received on Thursday, 8 January 2004 11:27:13 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:58:28 GMT