[Esml-users] Event ports with null event refs

Jesse Greenwald jesse at cis.ksu.edu
Mon May 10 14:07:34 CDT 2004


I've been taking a look at some of the example models that are included
with ESML.  While looking at them, I've noticed that some event ports on
some components have null event type refs.  That is, when I double click
on EventTypeRef box attached to the port, the following error message is
displayed: "Unable to show referred object of null reference".  Is this
an error in the model, or does this have a special meaning?

One example of this can be found in the MC__ModalSP model.  The ANY_pub
port of the BM__ModalComponentImpl has a null event type reference. 
But, when I double click TACTICAL_STEERING (from Interaction ModalSP_3)
and open up the component, it has a non-null event type ref.


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