Arithmetic extends 
ActivityNode,
DataFlowEdgeDestination,
DataFlowEdgesSource
An Arithmetic must have at least one incoming DataFlowEdge, representing the source values. When a DataFlowEdge sourced from a Arithmetic is evaluated, the value provided represents the arithmetic combination of the source values according to the operationType of the Arithmetic.
Four operationTypes
are defined for Arithmetic:
AND, SUBTRACT, MULTIPLY and DIVIDE;
each of these operations correspond to addition, subtraction, multiplication
and division, respectively. For DIVIDE arithmetic, the divisor
used in the arithmetic is the first incoming
DataFlowEdge with the
name "divisor". If the divisor
used in a DIVIDE arithmetic is equal to zero, the value of the
subsequent Arithmetic
node will not be numeric ("not-a-number", or NaN).
This model element may be removed from the IAML metamodel in the futureissue 220 , as these arithmetic operations can be replaced with XQueryFunctions.
[Arithmetic.html]