Rosetta Usage Guide Updates

The following reflects updates to the usage guide associated with the
current release.  Chapters are indicated followed by changes within
the chapter and a list of known To Do items.  Change bars are included
in the document to reflect where changes occur in the text.  There is
not a one-to-one correspondance between notations in this file and
change bars in the text.

When versions are released to the web, content specific to the
distribution should be appened to the CHANGELOG file with a date stamp
for the web release.  There is no need to do this each time a CVS commit
occurs, only for officially released versions.

CVS tags should be generated for each release using the form usageX-Y
where X is the major release and Y is the update number.

Inquiries should be directed to perry.alexander@ieee.org.

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Items, Variables, Values and Types

Mon Jun 25 11:01:25 CDT 2001 -- wpa
Removed change bars for start of next version.

Mon Jun 25 11:08:08 CDT 2001 -- wpa
Modified summary section to properly summarize subtype definitions.

Mon Jun 25 11:13:28 CDT 2001 -- wpa
Changed "is" in the let form to "be" for readability purposes.  The
semantics does not change.

Mon Jun 25 13:28:29 CDT 2001 -- wpa
Added domain-based facet subtypes.  Specifically, the domain of a facet
can be used as its type.

Thu Jun 28 10:39:58 CDT 2001 -- wpa
Added an elsif capability to the if expression.  It simply supports
nesting if expressions using a convenient syntax.

Thu Jun 28 11:00:54 CDT 2001 -- wpa
Added a case statement that is semantically equivalent to selective union
in functions.



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