What is a line condition?
A line condition is a condition that acts as a filter on a data selection. Only data selection objects can use line conditions. The line condition determines two things: what lines (or records in the case of a database emulation) to display in the data selection, and whether to display an empty line for any line (or record) that does not display. Line conditions only make sense for data selections that extend over more than one line of the data page (or record of the record set in the case of a database emulation).
A line condition performs its test on each line of the data page a data selection object references. There are three types of line conditions you can define: one that tests for the presence of a text string, one that tests for the absence of a text string, and one that you define yourself using a PlanetPress Talk expression.