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Typically, a two-dimensional control table contains value/action pairs and may additionally contain operators and [[type system |type]] information such as the ___location, size and format of input or output data, whether [[data conversion]] is required. The table may contain [[array index |indexes]] or relative or absolute [[pointer (computer programming)|pointer]]s to generic or customized primitives or [[subroutine]]s to be executed depending upon other values in the row.
The type of values used to in a control table depends on the [[computer language]] used for the interpreter. [[Assembly language]] provides the widest scope for [[data types]] including [[machine code]] for lookup values. Typically, a control table contains values for each possible matching class of input together with a corresponding pointer to an action subroutine. For a language without [[pointer (computer programming)|pointer]] support, the table can encode an index which can imply an offset value that can be used to accomplish the same as a pointer.
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