3.1 Adding rule classes (Rule Properiteis)

Figure 7. Properties of "Steam-Mov-Rule".

First we edit the properties of the Steam-Mov-Rule. We put the conditional failure probabilities in the notes were we can look at them. Next we turn our attention to the the signature display on the bottom part of the Rule properties editor (Figure 7). This shows the expected types of inputs and outputs for this rule. Setting the signature allows the designer of the rule to control where it can be used. A connection is valid only it matches the signature. A rule starts out with a very generic signature and we set the signature to the current connections. However, in this example, we want something slightly more general. The input variable is fine, but we would like the output variable to be "MOV" not "Mov-25-B". To get this effect, we use the signature editor tool (Figure 8).

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