Form specification files / Form file concepts |
[(] bool-expr {AND|OR} bool-expr [)] [...]
[NOT] { field-tag { = expression | <> expression | != expression | <= expression | >= expression | < expression | > expression | IS [NOT] NULL | [NOT] BETWEEN expression AND expression | [NOT] MATCHES "string" | [NOT] LIKE "string" } }
Some form specification file attributes such as COLOR WHERE require a boolean expression. These boolean expressions are different from the language boolean expressions, and have a limited syntax which is specific to the form files.
When a field-tag is used in the boolean expression, the runtime system replaces field-tag at runtime with the current value in the screen field and evaluates the expression.
EDIT f001 = item.price, COLOR=RED WHERE f001 >= 100 AND f001 < 1000;