IS-SDF-LIST( ) Analyze string against criteria for SDF lists

The IS-SDF-LIST( ) function analyzes whether a string expression is an SDF list of the format ’<element1>,<element2>,...,<elementn>)' where <elementi> is a character sequence that must not contain any comma (except within parentheses).

Result type: BOOLEAN

IS-SDF-LIST( )

STRING = string_expression