RE: [xtm-wg] Modified diagram for Association Template

["Chris Angus" <chris.angus@btinternet.com>]

Daniel

It was definitely the 1 that bothered me!  Apologies, I should have made
that clear.

Chris

-----Original Message-----
From: Daniel Rivers-Moore [mailto:daniel.rivers-moore@rivcom.com]
Sent: 09 January 2001 19:44
To: xtm-wg@egroups.com
Subject: RE: [xtm-wg] Modified diagram for Association Template


The association template places constraints on the classes of object that
may play each role in the association.

There may be more than one permitted class of player for certain roles. For
example, the role of "employer" in the "employer-employee" association may
be played by a person or an organization. The employer-employee template
might have the class "person" as the class of player of role "employee", and
the classes "person" and "organization" as the classes of player of role
"employer".

Does that answer your query? Or was it the 1 that bothered you, rather than
the * ?

Daniel

-----Original Message-----
From: Chris Angus [mailto:chris.angus@btinternet.com]
Sent: 09 January 2001 12:09
To: xtm-wg@egroups.com
Subject: RE: [xtm-wg] Modified diagram for Association Template


Daniel

I do not understand why the 'class of player' cardinality is shown as
'1..*'.

Chris

-----Original Message-----
From: Daniel Rivers-Moore [mailto:daniel.rivers-moore@rivcom.com]
Sent: 09 January 2001 09:38
To: 'xtm-wg@egrouops.com'
Subject: [xtm-wg] Modified diagram for Association Template


Attached is a modified graphic for the conceptual model of Association
Template.

It is structurally identical to the previous diagram. However, it renames
some of the elements to make it clearer that the association template is
itself and association, the role constraints are themselves a role in the
template association. An alternative approach would have been to add
subtype-supertype arrows from the left and middle boxes in the top row to
the corresponding boxes in the bottom row. However, this makes for a
cluttered diagram which is less easy to understand, and results in a larger
number of named object types in the conceptual model and therefore more to
do in the mapping between the model and the syntax.

 <<cd.AssociationTemplate.20010108.gif>>

Daniel




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