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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We are encountering problems using BON2 with subtypes and
instances.<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'>Take models A and B. Instantiate model A into model B,
creating A(inst). Then create a subtype of model B and call it B(sub). Model B(sub)
now contains A(inst)(inst), which seems to be considered an instance of A(inst)
by GME.<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'>Our interpreter finds A(inst)(inst) within B(sub). We first
call getTypeInhObject() to acquire the TypeInhObject for A(inst)(inst). Then
we call isInstance() on it, which returns true. However, when we call
getType(), we get a null object.<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'>This seems like a strange case, so I wanted to see if we’re
missing some detail that prevents us from finding the type of A(inst)(inst).
The end goal is to trace all of the way back to A from A(inst)(inst).<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 would be glad to clarify the case if this description is
especially confusing. </span></font><font size=2 face=Wingdings><span
style='font-size:10.0pt;font-family:Wingdings'>J</span></font><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'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Adam Nagel<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Staff Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ISIS / <u1:place u2:st="on"><u1:PlaceName u2:st="on"><st1:place
w:st="on"><st1:PlaceName w:st="on">Vanderbilt</u1:PlaceName></st1:PlaceName> <u1:PlaceType u2:st="on"><st1:PlaceType
w:st="on">University</u1:PlaceType></u1:place></st1:PlaceType></st1:place></span></font><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=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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