Hi, I have quickly explored the documentation. So I am sorry if I have overlooked something essential. I use a graph file exported from gephi (xml file(graphml)) </node> <node id="672712520"> <data key="label">672712520</data> <data key="size">10.0</data> <data key="r">153</data> <data key="g">153</data> <data key="b">153</data> <data key="x">25781.25</data> <data key="y">14798.744</data> </node> However, the the node id object is not listed as a property map (in my case it's not the same as the label for all nodes) Is it possible to access this value? Second, what is the optimal method to find the vertice number for a known property value(ID or label)? Thanks, Håvard -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.