# File lib/graphviz.rb, line 484 484: def <<( oNode ) 485: raise( ArgumentError, "Edge between root graph and node or cluster not allowed!" ) if self.pg.nil? 486: 487: if( oNode.class == Array ) 488: oNode.each do |no| 489: self << no 490: end 491: else 492: return GraphViz::commonGraph( oNode, self ).add_edge( self, oNode ) 493: end 494: end