What does it do? This addition to statement CALL TRANSFORMATION can be used to submit object references e1 e2 ... to a XSL transformation as external objects o1 o2 ... in order to call their methodd there.
Instead of using a static parameter list, the objects can be submitted dynamically as value pairs in the column in internal table otab, which has type ABAP_TRANS_OBJBIND_TAB from type group ABAP.
Latest notes:Addition OBJECTS is obsolete. External objects are treated like parameters, and object references should be submitted with the addition PARAMETERS.