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[Handle-info] Re: HVT - A concrete example - How to implement?

Hi Tony 

Thanks for the follow up and further explanation on types. So, I understand
how a type (identified by a handle) might define a service interface, e.g.

12345/MyAPI

which would effectively class a set of service behaviours. Is that right?
Although I note you use the word "interface".
This is indeed a potential use of handle value type and one that I think
would be useful.
Service behavior, interface, for the purpose of our discussion, they
refer to the same logical concept of a handle value pointing a specific
service with specific set of publicly accessible operations.


So, to consider a concrete example - OpenHandle.

This is an open source project with an API that has a clearly defined set of
semantics. Returns one serialization (of a number of defined serializations)
of the handle value set for a handle.

Any ideas as to how you think this could be configured as a HVT? Under whose
naming authority, etc.? And would it be registered in the type registry? And
what handle values might be incorported into the HVT handle?

There is an instance of a service running at this base URI

http://nascent.nature.com/openhandle/handle?

although it is not intended that this be the only service - or even the
permanent location. I did toy with the idea previously of having a directory
of registered service endpoints, for experimental purposes registered under

hdl:10100/openhandle

See

http://nascent.nature.com/openhandle/handle?format=json&id=10100/openhandle

But that was just an early thought. Would be useful to register this service
type with an HVT and from that to be able to locate service instances.

Cheers,

Tony
As you mention, the OpenHandle could be bought into the HVT registry to dereference the location of
the location of the service instance.

http://nascent.nature.com/openhandle/handle?format=json&id=10100/openhandle

could be expressed in a handle value as the type value combination
10320/JSON   10100/openhandle

The 10100/openhandle handle will be processed according to the information (web proxy) associated
with the 10320/JSON value type handle.

I think that in the longer term, the registration of the abstract services (as opposed to the handle value type)
such as OpenHandle into the HVT will be the logical extension of the type registry. Each service (and its interface)
would have their own handles.

The registry will then provide the ability to search for services based on their interface inputs, outputs, and
value added processing. Sort of like a web yellow pages (smart web) but with typed service information which would
allow you more interoperability and maybe true distributed processing.

The type registry will have an OpenURL base service prototype to demonstrate this functionality.

Note that the abstract services will require a slightly different description schema than the one used
for the handle value type.

-Christophe






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