Hello list, I am currently working with graph_tool to analyse text documents. let's say that in my graph each vertex is a word that appears in the text and each edge corresponds to a relationship between two words. Because of the fact that vertex is individuated only by its index i suppose to use a vertex property map (let's call it 'name', of type 'string') to put the word related to the vertex, assuring a bijective property of the "word <-> vertex index" function. Intuitively i'd like to do something like idx = g.vertex("example"). I cannot see how to implement it with the PropertyMaps because i can only have the function "vertex index -> word". I cannot keep the "word -> vertex index" elsewhere because remove_vertex() is changing my indexes under my feet. Does anybody of you have a suggestion? Thank you very much, Elia Bruni