question: public boolean isHighlightable ( OMGraphic omg ) { return true ; }
target:  Query asking if OMGraphic is highlight-able, which means that something in the GUI should change when the mouse is moved or dragged over the given OMGraphic. Highlighting shows that something could happen, or provides cursory information about the OMGraphic. Responding true to this method may cause getInfoText() and getToolTipTextFor() methods to be called (depends on the MapMouseInterpetor).