RE: [wsdm] [Omod] concepts diagram and words

Title: Message

ok

 

-- Igor 
Sedukhin .. () 
-- (631) 342-4325 .. 1 CA Plaza, 
Islandia, NY 11788 

 

From: VAMBENEPE,WILLIAM (HP-Cupertino,ex1) 
[mailto:] 
Sent: Thursday, October 30, 2003 6:59 
PM
To: Sedukhin, Igor S; WSDM TC
Subject: RE: [wsdm] [Omod] 
concepts diagram and words

Thanks Igor. In the text below, can we replace "both of the above are 
currently out of scope of this specification" with "the specification of the 
above is currently out of scope for this specification" (the difference being 
that we won't normatively define them but we can talk about them, like we are 
doing for services).

 

I cringe a bit at the choice of "metric" in the last paragraph as an 
example, but since it's only an example...

 

Regards,

 

William

  

  
-----Original Message-----
From: Sedukhin, Igor S 
  [mailto:] 
Sent: Wednesday, October 29, 2003 
  12:42 PM
To: WSDM TC
Subject: [wsdm] [Omod] concepts 
  diagram and words

  
Long time ago I promised to 
  provide words that go along with the MOWS concepts diagram. Here they are. 
  Also attached is the diagram aligned with UML 2.0.

  
<<MOWS 
  Concepts.png>> 
So the words. 

  
" 
Management of Web services (MOWS) is a 
  particular case of Management using Web services (MUWS) in which a resource is 
  an element of a Web Services Architecture. The 
  Web services concepts, according to WSDL, are defined as follows. A service is 
  an aggregate of endpoints each offering the service at an address and 
  accessible according to a bidning. A service has a number of interfaces that 
  are realized by all of its endpoints. Each interface descibes a set of named 
  messages that could be exchanged and their format. Properly formatted messages 
  could be sent to an endpoint's address in a way prescribed by the binding. A 
  description (document, artifact) is composed of definitions of interfaces and 
  services. A description may contain both or either of the 
  definitions.

  
An IT resource may bear some 
  functional (e.g. business) responsibilities such as, for example, placement of 
  an order. That would constitute a functional capability with the distinct 
  semantics of placing an order. A functional resource is a composition of such 
  capabilties. An endpoint may provide access to the functional resource and in 
  that case would offer those capabilities. Such endpoint is called a functional 
  endpoint. To offer a capability an endpoint has to realize interfaces. An 
  interface that represents a functional capability is called a functional 
  interface. There is one to one match between capabilities and 
  interfaces.

  
The MUWS concepts are defined very 
  similarily to the functional concepts. There is a manageable resource that is 
  a resource composed of a number of manageability capabilities each represented 
  by a manageability interface.

  
Management of Web services starts 
  from an endpoint resource which therefore becomes manageable resource called 
  manageable endpoint. The reason the endpoint is the basis element is that (1) 
  anything behind an endpoint is a concrete implementation (e.g. an application 
  hosted in a container), and (2) anything that builds on endpoints is a logical 
  construct and therefore understaning of it has to be inferred. Both of the 
  above are currently out of scope of this specification.

  
Because manageable endpoint is a 
  manageable resource it is a composition of a number of manageability 
  capabilities. Some of the capabilities may be generic, defined in MUWS and 
  some may bear semantics specific to MOWS. For example, metrics available on 
  Web services endpoint resources only may be captured in a UML model called 
  EndpointMetrics which can be represented (rendered) into a WSDL interface 
  description defined in a "urn:wsdm:webservice:endpoint:manageability:metrics" 
  namespace. The UML model is an instance of the manageabilty capability concept 
  and the WSDL interface description is an instance of the manageability 
  interface concept.

  
" 

  
-- Igor Sedukhin 
  .. () 
-- (631) 342-4325 .. 1 CA Plaza, 
  Islandia, NY 11788