[soa-rm] core nature of a Service-Oriented Architecture [was: Security]

[Ken Laskey <klaskey@mitre.org>]

Consider the following excerpted from the OWL-S spec  
http://www.w3.org/Submission/2004/SUBM-OWL-S-20041122/.

<OWL-S>... the information necessary for Web service discovery could be  
specified as computer-interpretable semantic markup at the service Web  
sites, and a service registry or ontology-enhanced search engine could  
be used to locate the services automatically. Alternatively, a server  
could proactively advertise itself in OWL-S with a service registry,  
also called middle agent [4,25,15], so that requesters can find it when  
they query the registry. </OWL-S>

So, for the former case, I am Big-Name company and I don't care about  
no stinkin' public registry because my intent is to have you come to my  
Web site for all your xxx needs.  Thus, I use a tailored search engine  
and provide service access information in response to the search.

Alternatively,

<OWL-S> In the description so far, we tacitly assumed a registry model  
in which service capabilities are advertised, and then matched against  
requests of service. This is the model adopted by registries like UDDI.  
While this is the most likely model to be adopted by Web services,  
other forms of registry are also possible. For example, when the demand  
for a service is higher than the supply, then advertising needs for  
service is more efficient then advertising offered services since a  
provider can select the next request as soon as it is free;  
furthermore, in a pure P2P architecture there would be no registry at  
all. Indeed the types of registry may vary widely and as many as 28  
different types have been identified [26,4]. By using a declarative  
representation of Web services, the service profile is not committed to  
any form of registry, but it can be used in all of them. Since the  
service profile represents both offers of services and needs of  
services, then it can be used in a reverse registry that records needs  
and queries on offers. Indeed, the Service Profile can be used in all  
28 types of registry. </OWL-S>

I have not checked out the 28 but these may provide some challenges to  
consider for the RM.

Ken

On Apr 13, 2005, at 12:13 AM, Rex Brooks wrote:

> [snip]

> It strikes me that the core nature of a Service-Oriented Architecture  
> lies in a transactional model in which a Service Provider or Service  
> Producer publishes a named set or container of a service or services,  
> the description of which is searchable by a Service Consumer according  
> to some set of features or criteria which our RM provides.
>
> Even at a high level of abstraction, this will prove a test for us.
>
> Ciao,
> Rex
>
>
------------------------------------------------------------------------ 
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Ken Laskey
MITRE Corporation, M/S H305     phone:  703-883-7934
7515 Colshire Drive                        fax:        703-883-1379
McLean VA 22102-7508

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