Re: [wsrf] WS-Resource specification; section 2.1 - properties

[Rich Thompson <richt2@us.ibm.com>]

I agree that those are the considerations.
I would favor the definition saying one or more properties as this is talking
about the properties defined by the service rather than the properties
that currently have a value at a particular endpoint, though perhaps that
could be clarified in the language. I don't see the value of a WSRF compliant
service defining zero properties. 

Rich

Ian Robinson <ian_robinson@uk.ibm.com>

10/08/2004 07:17 AM

To	Rich Thompson/Watson/IBM@IBMUS
cc	wsrf@lists.oasis-open.org
Subject	Re: [wsrf] WS-Resource specification; section 2.1 - properties

Part of the definition of WS-Resource is:

"The set of properties of the resource MUST be expressed using an
XML
Infoset described by XML schema. "

WSRF_RP defines how this MUST be described by a resource properties
document associated with the portType.

A portType that offers no resource properties document would have pretty
limited value in WSRF terms - what aspect of WSRF would it be using? On
the
other hand, there may be periods of time when a WS-Resource has no
properties and so the resource properties document could be empty. That
is
why the resource has a set of zero or more properties, all of which can
be
described in the resource properties document.

Regards,
Ian Robinson
STSM, WebSphere Messaging and Transactions Architect
IBM Hursley Lab, UK
ian_robinson@uk.ibm.com


                    
                     
                     
          
             Rich Thompson    
                     
                     
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                  [wsrf] WS-Resource
specification;   
                    
                  section
2.1 - properties            
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          





I am trying to see the value in the statement:


         It MUST have a set of zero or more properties
which are
expressible in XML infoset.


The inclusion of zero appears to cancel the MUST. My understanding of
properties is that they offer a view onto some portion of the state of
the
resource. I'm guessing that the reason for including the zero in the
statement is that some WS-Resources may choose to only offer
operation-based access to their internal state. From that as a basis, I
would offer the following alternate text:


         It MAY expose some portion of its state using
properties which are
expressible in an XML infoset.

Of course, another alternative is that offering zero properties is a
standard Web service and outside the domain of WSRF, in which case the
original text just needs the "zero" changed to "one".

Rich Thompson

                    
                     
                     
          
 Steve Graham/Raleigh/IBM@IBMUS            
                     
         
                    
                     
                     
          
                    
                     
                     
          
 10/01/2004 06:22 PM                
                     
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      [wsrf] [wsr] WS-Resource  
                    
                     
      specification            
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          
                    
                     
                     
          






WSRFers:

The task force to formalize the WS-Resource definition has completed a
draft and posted it to the WSRF site [1]
This reflects the hard work and tough discussions amongst the team,
primarily:
Steve Graham, Anish Karmarkar, Jeff Mischkinsky, Ian Robinson, and Igor
Sedukhin.
I want to thank this task force for a month or so that was never dull,
and
very informative.

The document accomplishes the following:
a) defines terms: resource, resource identifier, WS-Resource, WS-Resource
Reference
b) defines the concept of a WS-Resource Access Pattern (the new improved
name for "implied resource pattern")
c) defines 5 embodiments of WS-Rsource Access Pattern:
1. WS-Addressing using Reference Properties
2. WS-Addressing without Reference Properties
3. WSDL 1.1 Service element
4. WSDL 1.1 Binding element
5. WS-Message Delivery.

Now, the work is not complete.  There are some remaining items that
the TF
knows needs clarification and there may be other issues that are raised
when more eyes and minds are focused on the problem.  Known remaining
issues:
a) The definition of a Ws-Resource has some fine tuning needed.  There
are
comments in section 2.3 regarding this.
b) The second WSDL 1.1 embodiment (section 3.4) is subtle and could use
some further clarification, motivation, explanation.

[1]http://www.oasis-open.org/apps/org/workgroup/wsrf/download.php/9547/wsrf-WS-Resource-1.2-draft-01.doc


sgg
++++++++
Steve Graham
(919)254-0615 (T/L 444)
STSM, On Demand Architecture
Member, IBM Academy of Technology
<Soli Deo Gloria/>
++++++++