-- @atlcompiler emftvm
-- @path Graph=/TTC2011/metamodels/graph.ecore
query nrOfDanglingEdges = Graph!Graph.allInstances()->first().danglingEdges->size().debug('nrOfDanglingEdges');

helper context Graph!Graph def : danglingEdges : Sequence(Graph!Edge) =
	self.edges->select(e|e.src.oclIsUndefined() xor e.trg.oclIsUndefined());