SoBoolOperation(3) on Linux
The text 0ad33243d9f6, as Debian 7 (Wheezy) shipped it.
The SoBoolOperation engine evaluates expressions of boolean logic. The multivalue fields SoBoolOperation::a and SoBoolOperation::b are combined according to the operations set in SoBoolOperation::operation, with the resulting TRUE or FALSE value set on SoBoolOperation::output.