The interface device includes a field that stores an output knowledge variable, input and local {HEAD ~ fields} that store knowledge variables for operating the output knowledge variables, and a field that stores a computing equation of declarative representation that utilizes knowledge variables using {TAIL ~ operands} as other knowledge variables 
The interface device includes a field that stores an output knowledge variable , input and local { HEAD ~ fields } that store knowledge variables for operating the output knowledge variables , and a field that stores a computing equation of declarative representation that utilizes knowledge variables using { TAIL ~ operands } as other knowledge variables
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH