EXPRESSIONOF enables you to express references to objects using complex operators and delimiters. EXPRESSIONOF is normally used with the special argument DATA, which refers to data elements and data structures; like this: EXPRESSIONOF DATA.

This keyword combination provides a text box in which definition values are entered as a series of strings. The division between one definition value and the next is determined by white space. By convention, + (plus sign) is used to divide the individual definition values, but it is not required.