CM questions

I'm trying to understand how best to use CM when programs share files

I have several projects , grouped into directories:

A, B, C

each of A, B and C share more than 1 file.  So for example

A,B and C will each have in there respective .cm files:

Library
   structure A/B/C ...
   structure common1.sml
is
...
   A/B/C.sml
   common1.sml

So now the tricky part.  It turns out that project A needs to use  
Project B.

CM complains that file common1.sml appears in more than 1 group.   
NOTE: The problem with this error message is that I am using a  
"library" for these definitions but the error message specfically  
says that the file appears in more than 1 "group".  A little  
confusing given that  libraries _and_ groups can be defined.

So I'm wondering what the best way to organize this is.

 From reading the CM docs it looks as though what I want to do is to  
take each of the individual files which are shared and wrap them in  
their own library.

However it also appears that duplicate files are OK if you are using  
groups.

Can someone exaplain the difference between groups and libraries ?
What is the best way to organize these dependencies ?

Thanks

Brian


So here is the way I think it should work using library.

in A.cm:

library
   structure A
   structure common1
is
   a.sml
   common1.sml

in B.cm:

library
   structure A
   structure B
   structure common1
is
   a.cm
   common1.sml
   b.sml

So I am assuming that what I really want is:

A.cm

library
   structure A
   structure common1
is
   common1.cm
   a.sml

B.cm

library
   structure B
   strucuture common1
is
   b.sml
   common1.cm

common1.cm

library
   structure common1
is
   common1.sml


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