A list of method
tables for the parents of the class being implemented. The SOM API specifies
that the list of parent method tables for a given class be stored in the
auxiliary class data structure of the class, in the parentMtab component.
Thus, for the class "XYZ", the parent method table list is found in location
XYZCClassData.parentMtab. Parent method table lists are available
from class objects via the method call somGetPClsMtabs.