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The first thing most macros do is checking input parameters. Still, many macro users are unsure when it comes to implementing the parameter checks. This is the case even with the most elementary form, namely the check of the existence of a parameter value, or the "Is-Blank" check. One reviews and compares various ways to implement it. The paper then recommends one that performs well given various input parameter values, packaged in a function-style macro %ISBLANK(), which returns 1 when the parameter value is "Blank," and 0 otherwise.
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