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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Matt,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for the explanation on this, especially
the part that implies that running into this situation doesn’t mean that my
language is all screwed up </span></font><font size=2 color=navy
face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;color:navy'>J</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If it’s not already there, just a $.02
suggestion, it might be worth mentioning something about this topic in the GME on-line
documentation in one of the sections describing Aspects… I think I’ve
run into it twice now without even trying, but then again sometimes I have bad
luck with these things … [you’d think I would’ve remembered straight
off how to deal with it the 2<sup>nd</sup> time, right? </span></font><font
size=2 color=navy face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:navy'>J</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> ]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Along those lines, has there been any talk
or consideration of a Wiki-like forum for GME users? I’m aware of
the JIRA tool but that seems more focused on GME bugs/issues, etc. A Wiki
kind of tool might make a nice complement to the gme-users list… [with
enough GME end-user contributions, of course </span></font><font size=2
color=navy face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;
color:navy'>J</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> ] As an added
bonus, Wikis aren’t out of style yet so it’d be totally trendy! <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-ace<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
gme-users-bounces@list.isis.vanderbilt.edu
[mailto:gme-users-bounces@list.isis.vanderbilt.edu] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Matthew J. Emerson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 05, 2006 3:09
PM<br>
<b><span style='font-weight:bold'>To:</span></b> gme-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [gme-users]
Intersection of aspects the referred modelsmighthaveis empty?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The error is a limitation imposed by the
way GME visualizes references to Models that expose ports.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In a particular Model, one Aspect may
include one set of ports object and a second Aspect may include a second set of
port objects. GME has to know which set of ports to show in every different
place where that kind of Model can be created – basically, which of the
Aspect of the Model gives its external interface for a particular context.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The same thing holds true for References
to Models. However, one Reference can refer to two different Model types. If
the different Model types to which a Reference may refer have no common set of
Aspects, then GME might not be able to visualize a consistent interface for
objects of that Reference type.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>GME chooses the maximally-restrictive
solution for this problem by requiring that the set of models that may be
referred to be a Reference object share at least one Aspect. This lets GME
visualize each reference in each context the same way regardless of what the
referent object type is.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I think this is a technical/implementation
issue and doesn’t say much about language design.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;font-style:italic'>“does
the fact that the aspect is shared between the two models have any
significance?”<o:p></o:p></span></font></i></p>
<p class=MsoNormal><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Not in GME (currently). Aspects are purely
a visualization/complexity management concern. It happens that you can only
draw a line between two things that show up on the screen at the same time, so
related objects end up in the same Aspect. That doesn’t mean that all of
the objects in the same Aspect belong to any one conceptually-distinct
important facet of their containing object – this is why I often have
trouble thinking up good Aspect names.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Similarly, imagine that case that you want
to have a Reference which refers to two different Model types, neither of which
exposes any ports in any Aspect. Does it really matter if they don’t
share a common Aspect, when they will be visualized the same regardless?
There’s no harm in introducing “dummy” aspects in such a case
to get a paradigm to pass muster – in such a case GME’s
implementation is just overly-restrictive.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>--Matt<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> gme-users-bounces@list.isis.vanderbilt.edu
[mailto:gme-users-bounces@list.isis.vanderbilt.edu] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Ace Thompson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 05, 2006 3:53
PM<br>
<b><span style='font-weight:bold'>To:</span></b> gme-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [gme-users]
Intersection of aspects the referred models mighthaveis empty?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Sandeep,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks, this is definitely the situation I
have. Basically my “E” element (an FCO) has several
inheritors, one of which is a <<Model>> and another one is a
<<Reference>> to a Model. The second model has an aspect
“A”; when I add this aspect to the first model, it eliminates the
error. This isn’t really what I want language-wise, it’s sort
of spurious, but it seems to get around the issue until I have time to sit down
and figure out if I’ve made some fundamental language-design no-no on the
way to getting myself into this situation </span></font><font size=2
color=navy face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;
color:navy'>J</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>So while we’re on the topic, what
does it mean for two different models to have the same <<Aspect>>,
if the two different models aren’t in any other way related and
don’t contain any common sub-elements? GME and the
Meta-interpreter don’t seem to mind when I do this, and I get what I
would expect to get in each of the models if I had only assigned that Aspect to
that one model, but I guess the question is: does the fact that the aspect is
shared between the two models have any significance?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks a lot,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-ace<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
gme-users-bounces@list.isis.vanderbilt.edu
[mailto:gme-users-bounces@list.isis.vanderbilt.edu] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Sandeep Neema<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 05, 2006 11:54
AM<br>
<b><span style='font-weight:bold'>To:</span></b> gme-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [gme-users]
Intersection of aspects the referred models mighthave is empty?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ace,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don’t exactly recall it either,
but I think this may be related to when you have a reference to a base class
and there are multiple derived classes with conflicting aspects.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>HTH,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Sandeep<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=3 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
gme-users-bounces@list.isis.vanderbilt.edu
[mailto:gme-users-bounces@list.isis.vanderbilt.edu] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Ace Thompson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 05, 2006 1:44
PM<br>
<b><span style='font-weight:bold'>To:</span></b> gme-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> [gme-users] Intersection
of aspects the referred models might have is empty?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have a metamodel containing a <<Reference>>
“E” and when I try to register with the MetaGME Interpreter I get
the following error in the Metainterpreter Log:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Error: Reference “E” has no valid aspect. Intersection
of aspects the referred models might have is empty.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I _<i><span style='font-style:italic'>know</span></i>_
I’ve seen something like this before but I can’t remember what the
problem was (is) and (or) how to resolve it. I’m working on a smaller
model that duplicates the error, but in the meantime I’m wondering if
anyone knows off-hand what might cause this error to occur? Has anyone
seen this before? I’m using GME 5.9.21.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks for any insight that can be provided,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>-ace<o:p></o:p></span></font></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>____________<o:p></o:p></span></font></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Ace
Thompson<o:p></o:p></span></font></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Ignite
Analytics Corporation<o:p></o:p></span></font></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>acethompson@igniteweb.net<o:p></o:p></span></font></p>
<p class=MsoPlainText style='margin:0in;margin-bottom:.0001pt'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>m.
480 703 8909<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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