?– A Boolean condition that allows the transport only if it is true. The condition
is denoted within square brackets at the edge.
?– A weight that specifi es how many tokens are transported concurrently over
the edge as a minimum. The default (when nothing else is stated) is 1. This
weight information is written in the text form {weight n } , where n is a
natural number, or * is used for an unlimited number ( Figure 3.45 ). An arbitrary
number means that all tokens that come along will be transported.
?– A transformation transforms an object into another value. For example,
this can be a single attribute value of the object. The transformation can
be denoted in any language. It is written within a comment symbol that is
connected with the edge. The keyword ?«transformation?» precedes the
condition. The transformation in Figure 3.45 describes how to get from the
customer object to the PIN check code object. The point indicates that pin-
CheckCode is an attribute of customer .
It often happens in activity diagrams that there are very long edges, or edges
that run across other elements.
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