question: private void assertNotVariable ( final TermNode t ) throws VisitorException { if ( t == null ) return ; if ( ! t . isVariable ( ) ) return ; final VarNode v = ( VarNode ) t ; if ( v . isAnonymous ( ) ) { return ; } throw new VisitorException ( "Variable not permitted in this context: " + t ) ; }
target:  Method used to correctly reject variables in an INSERT DATA or DELETE DATA operation.