Requirements Document Update

The document is now on the web at:

    http://www.w3.org/XML/XProc/docs/langreq.html

Here's what I got to:

1. Consolidated requirements that I thought overlapped.

2. Implemented terminology change from the call.

3. Made the names of the requirements more descriptive.

4. Made terms definitions and used term references in the document.

5. Removed the Process Model term and tried to use Step in most
    places.

6. Reviewed and implemented most of Murray's comments.


-- 
--Alex Milowski