- <init>
Required shallow copy constructor.
- GT
Return t1 > t2
- LT
Return t1 < t2
- add
Return t1 + t2 (aka ADD).
- AND
Return t1 AND t2.
- EQ
Return t1 = t2 (aka EQ aka RDFTERM-EQUALS).
- GE
Return t1 >= t2
- LE
Return t1
- NE
Return t1 != t2
- NOT
Return t1 OR t2.
- OR
Return t1 OR t2.
- getFunctionURI