Issue 4913: Multiplicity of ReadExtentAction pins                                                                                                                                                                   (action-semantics-ftf)
Source: International Business Machines (Mr. Sridhar Iyengar, siyengar@us.ibm.com)
Nature: Uncategorized Issue
Severity: 
Summary: [Sridhar Iyengar] 27.5 ReadExtentAction class: Check the multiplcity of
the Output pins - it is 1 only in the metamodel diagram (see Other
Actions diagram) - However there is a well formedness rule [3] which
states that the result output pin has a multiplicity of unlimited -
which would make sense since we are dealing with extents.  Fix the
metamodel multiplicity and removing the wellformedness rule would
resolve this confusion.

Resolution: decline
Revised Text: 
Actions taken:
March 5, 2002: received issue
December 11, 2002: closed issue
Discussion: 
The metamodel multiplicity refers to how many pins there are.  The pin
multiplicity refers to how many values the pin may have at runtime.


End of Annotations:=====
Summary: Multiplicity of ReadExtentAction pins

Text:

[Sridhar Iyengar] 27.5 ReadExtentAction class: Check the multiplcity
of
the Output pins - it is 1 only in the metamodel diagram (see Other
Actions diagram) - However there is a well formedness rule [3] which
states that the result output pin has a multiplicity of unlimited -
which would make sense since we are dealing with extents.  Fix the
metamodel multiplicity and removing the wellformedness rule would
resolve this confusion.

From: Edwin Seidewitz <eseidewitz@intelidata.com>
To: "'action-semantics-ftf@omg.org'" <action-semantics-ftf@omg.org>
Subject: [Issue # 4913] Multiplicity of ReadExtentAction pins
Date: Tue, 5 Mar 2002 17:54:55 -0500 
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This is issue 4913: 

> Multiplicity of ReadExtentAction pins 
> 
> [Sridhar Iyengar] 27.5 ReadExtentAction class: Check the multiplcity
> of 
> the Output pins - it is 1 only in the metamodel diagram (see Other 
> Actions diagram) - However there is a well formedness rule [3] which 
> states that the result output pin has a multiplicity of unlimited - 
> which would make sense since we are dealing with extents.  Fix the 
> metamodel multiplicity and removing the wellformedness rule would 
> resolve this confusion. 

The specification is correct as written. The issue confuses the
required multiplicity of the number of output pins of the action,
which is 1, as shown on the metamodel diagram, and the required
multiplicity that must be specified for the "multiplicity" attribute
of the single output pin, which is required to be unlimited. The
"multiplicity" attribute of the output pin is a specification of the
multiplicity of the value that the pin can hold (remember that pins
can actually hold collections), not a metamodel-level multiplicity.

That is, a ReadExtentAction must have a single output pin. The result
of a ReadExtentAction is a collection of all current instances of the
given classifier. This collection is placed on the single output
pin. Since the collection is potentially unlimited in size, that
single output pin must have a specified multiplicity of "unlimited"
FOR THE VALUES THAT IT HOLDS.

-- Ed 

Ed Seidewitz, Chief Architect 
InteliData Technologies 
<mailto:eseidewitz@intelidata.com> 
<http:\\www.intelidata.com> 
Office: +1.703.259.3076 
Mobile: +1.301.455.3681