MTREE-STOP-IMMEDIATELY : FLAGMTREE-STOP-IMMEDIATELY is a flag or parameter.
If T, will stop an automatic search as soon as a closed
node is found. If NIL, will continue to generate whatever level of
the tree it was working on, and will check for closed nodes when
MTREE-STOP-IMMEDIATELY takes values of type BOOLEAN.
It belongs to subjects ETREES MTREE-TOP .
Its default value is T
Its current value is T.
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