work on the icon depictions. Icons are then annotated by the user with se-
mantic information such as connectivity (Figure 18.7), which is potential
behavior. Connectivity defines input and output ports of each icon. For in-
stance, a horizontal Street segment icon has inputs/outputs to its left and
right. Transforming the annotated Track creates an entire family of Track
icons (Figure 18.8, right), which essentially act as throughputs for objects
that move on them.
This semantic and syntactic connectivity information about an icon is
used to support pupstitution in PBAE. By ...
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