Abstract: A computerized data processing system and method are provided. One embodiment of the system of the present invention includes a computer-readable memory for storing a definitional data table for defining variable symbols representing respective measurable physical phenomena. The definitional data table uniquely defines the variable symbols by relating them to respective data domains for the respective phenomena represented by the symbols. The system also includes a comparator for signaling existence of a match condition if both a symbolic description in an object instance describing at least one measured phenomenon matches one of the variable symbols in the table and an actual value, also in the object instance, of the at least one measured phenomenon conforms to a respective data domain defining the one variable symbol in the table.