Fred,

Thank you for this excellent document.

I have read the other comments, posted by Hiro and Ellen.

My comments are as follows:

- In Figure 4, there is a block for OGSA Use Cases.
  Might this be the OGSA Reference Model?

- I found myself stumbling over a couple of phrases:

    Line 36 of the original document says 

      An information model for OGSA entities allows
      the integration and interoperability of the services
      and resources participating . . .

    I might rephrase like so:

      An information model for OGSA entities allows
      integration of and interoperability between
      services and resources participating . . . 

    Line 54 of the original document says

      An information model is abstraction and representation of entities

    Is it more correct to say

      An information model is an abstraction that represents entities
    or
      An information model is an abstraction representing entities

Great document Fred!