TestNode performs a test on a single 3 element expression in a decision tree. The expression is of the form: a eq b, a ne b, a lt b, a gt b, a lte b, a gte b where a is a RuntimeValue, b is a FixedValue and the letters between represent the comparison operations: ==, !=, <, >, <=, >= The comparison chars are also supported directly but may confuse XML parsers when used inside an attribute value.

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