6.11 Selection Tree Qualifiers
Selection Tree Qualifiers (STQs) are a method of defining a path to a certain entry in a selection tree. Each node or subnode in a tree may be assigned a qualifier, which is a positive integer. The STQ of the node is set in the Qualifier field. As the tree is executed, these numbers are combined to give a unique path to the entry currently being evaluated. As an example, a node may be assigned the STQ 1, the first subnode of this be assigned the STQ 14 and a further subnode may be assigned the STQ 45 and a modifier in this subnode be evaluated. The path to this modifier is thus 1,14,45 as the modifier is being evaluated. Figure 92 shows an example of a node, where the STQ has been set to 2.
Figure 91 An Example of an STQ
Multiple nodes may have the same STQ, in which case the Recycle icon will be activated, indicating that the STQ number is being reused. Figure 93 shows this icon.
The STQ path to the modifier, condition or subnode being evaluated may be found in the trace while simulating the tree in question. Figure 94 shows the simulation trace for the STQ path laid out earlier in this chapter.
