Table 1.

The Built-Ins in SWRL.

Built-In	Example	Example Explanation
Comparisons	swrlb:equal	If the first argument and the second argument are the same.
Math	swrlb:abs	If the first argument is the absolute value of the second argument.
Boolean Values	swrlb:booleanNot	If the first argument is true and the second argument is false, or vice versa.
Strings	swrlb:startsWith	If the first argument starts with the second argument.
Date, Time and Duration	swrlb:time	If the first argument is the xsd:time representation, followed by arguments of hours, minutes, seconds and timezone.
URIs	swrlb:anyURI	If the first argument is a URI reference, followed by arguments of scheme, host, port, path, query and fragment.
Lists	swrlb:empty	If the first argument list is empty.