Issue 2216:  Issue with the algorithm for evaluating $<variable> expressions (notif_service-rtf)
Source:  (, )
Nature:  Uncategorized Issue
Severity: 
Summary: Summary: The algorithm for evaluating $<variable> expressions does not
     allow for $domain_name and $type_name to be used.
 

Resolution: Added text to middle of 2nd to last paragraph in section 2.4.5 (the 1st change bar on page 47)
Revised Text: 
Actions taken:
November 17, 1998: received issue
November 16, 1999: closed issue
Discussion: 
Synopsis: Section 2.4.5 describes an algorithm for evaluationg $<variable>

          expressions. As currently stated, the algorithm would not allow

          for $domain_name and $type_name to be used, since the text states

          that it can only be applied to resolve simple-typed members of

          $.header.fixed_header, when in fact the domain_name and type_name

          members of the fixed header are nested within the EventType

          structure, and are therefore non-simple-typed members. The proposed

          resolution is to re-word the relevant text to state the the

          algorithm can resolve $domain_name, $type_name, and $event_name to

          $.header.fixed_header.event_type.domain_name,  

          $.header.fixed_header.event_type.type_name, and

          $.header.fixed_header.event_name, respectively. 



Disposition: I agree with the issue and the proposed resolution. The current

             text is legacy from before the fields in question were made part

             of a complex data type.



VOTE: YES means to re-word the text as recommended; NO means to do nothing
End of Annotations:=====
Return-Path: <dud@dstc.edu.au>
To: issues@omg.org
Cc: notif_service-rtf@omg.org
Subject: Notification Service Issue
X-face:
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Date: Tue, 17 Nov 1998 15:02:13 +1000
From: Keith Duddy <dud@dstc.edu.au>

Issue: The algorithm for evaluating $<variable> expressions does not
    allow for $domain_name and $type_name to be used.

    "The following rules govern translation of a run-time variable,
    '$variable', into a specific event field. If the run-time variable
    is reserved (e.g., $curtime) this translation takes precedence.
    Next, the first matching translation is chosen respectively from:
    a simple-typed member of $.header.fixed_header, properties in
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    $.header.variable_header, and properties in
    $.header.filterable_data. If no match is found, the translation
    defaults to $. variable."

As domain_name and type_name are now nested in the (non-simple) type
EventType which is a member of the 'event_type' field of the
header.fixed_header they are inaccessible using this definition.

Suggested fix:

The text should be reworded:

    The following rules govern translation of a run-time variable, 
    '$variable', into a specific event field. If the run-time variable
    is reserved (e.g., $curtime) this translation takes precedence.
    The variables $domain_name, $type_name and $event_name are
    substituted by $.header.fixed_header.event_type.domain_name,
    $.header.fixed_header.event_type.type_name and
    $.header.fixed_header.event_name respectively. Next, the first
    matching translation is chosen from properties in
    $.header.variable_header and then properties in
    $.header.filterable_data. If no match is found, the translation
    defaults to $. variable.


--
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Keith Duddy  : dud at dstc.edu.au  :
http://www.dstc.edu.au/AU/staff/dud
	    CRC for Distributed Systems Technology (DSTC)
   General Purpose South, University of Queensland, 4072, Australia
	    ph: +61 7 336 5 4310  ::  fx: +61 7 336 5 4311
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