Dear Authors:

The term "Capability Layer" defined by the "draft-ietf-i2nsf-terminology-00" 
carries different  meaning than the "Capability Layer" used by the I2NSF 
charter.

"draft-ietf-i2nsf-terminology-00":
Capability: Defines a set of features that are available from a managed entity 
(see also I2NSF Capability).

Capability Layer: Defines an abstraction layer that exposes a set of 
capabilities of the I2NSF system.

I2NSF Charter:
I2NSF will specify interfaces at two functional levels for the control and 
monitoring of network security functions:
The I2NSF Capability Layer specifies how to control and monitor NSFs at a 
functional implementation level. The term "Functional Implementation" is used 
to emphasize that the rules (for control and monitor) of NSFs have to be 
implementable by most NSFs. I2NSF will standardize a set of interfaces by which 
a security controller can invoke, operate, and monitor NSFs.

The I2NSF Service Layer defines how clients' security policies may be expressed 
to a security controller. The controller implements its policies according to 
the various capabilities provided by the I2NSF Capability Layer. The I2NSF 
Service Layer also allows the client to monitor the client specific policies.

If we use the definitions by the "draft-ietf-i2nsf-terminology-00", we should 
create a different terminology to represent the "South bound Interface" between 
Controller and NSF.

Thanks, Linda


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