Composing expressionsExpression Syntax
Expressions are used for calculating numerical values, strings or logical values ("true" or "false"). There are various operators and functions available for this, comparable to a programming language ("Pascal" in this case), which can be used to do many kinds of calculations. You can do operations with data fields, for example calculate the tax for a given amount, or merge two data fields into one string. Please note that if the expression is a property of a report band, the result of the expression must be a logical value. Only the group band expects the result to be a string or a number, just like the expression-field report-element.