question: returns the result of interpreting the object as an instance of ` plane ' . this implementation returns null ; returning a non-null result will terminate the switch . concode_field_sep DiPackage modelPackage concode_field_sep T caseShape concode_elem_sep T caseNode concode_elem_sep T caseDiagramElement concode_elem_sep T caseLabeledShape concode_elem_sep T caseEdge concode_elem_sep T caseLabeledEdge concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T caseDiagram concode_elem_sep T caseStyle concode_elem_sep T caseDocumentRoot concode_elem_sep T defaultCase concode_elem_sep T caseLabel
target: T function ( Plane arg0 ) { return null ; }