[Nml-wg] Schema changes

[Freek Dijkstra]

Regarding the schema at
http://forge.gridforum.org/sf/go/doc15481

During the last OGF meeting, the following changes have been proposed.



- Martin: rename Port/Interface -> Port
(Freek: make it clear in the description that this concerns a logical
port, not a physical port)

- Martin: rename Device/Node -> Node

- Guy: rename Network Element -> Network Object
(as "network element" has a well established but different meaning in
other organisations, namely that what we call Node)

- Freek: Port is unidirectional (not bidirectional. This suggestion is
based on experience with multicast, and complex adaptation stacks, which
were harder to describe using bidirectional Ports. Suggested by Guy)

- Freek: Adaptation and Deadaptation are separate classes (to make it
unidirectional, just like links)

- Martin: Make transport processing functions (Adaptation, Deadaptation
and Unidirectional Link) a subclass of Service
(see separate email)

- Freek: Change the hasPort relation Node-Link to Group-Link and make
Node a subclass of Group. This allows a relation between Port and
Topology (for describing edge interfaces of a domain, which was not
possible with the current schema).

- Martin: Add time-based information. Each network object can point to
_multiple_ time intervals (with start time and end time). The meaning is
that if "the network object is available" during these time interval(s).
It was shortly discussed that time intervals can be used for both
inventory management as well as reservation data, though it is not yet
entirely clear if this can be described with the same type of relation
from network object to time interval.



Regards,
Freek Dijkstra