gephi/trunk — Issue #147: graphml `edgedefault` not handled to spec
Author: mbastian
Created: 2011-10-22 16:43:12+00:00
State: open
Labels: Confirmed, import, Medium

from http://graphml.graphdrawing.org/primer/graphml-primer.html#GraphGraph

Graphs in GraphML are mixed, in other words, they can contain directed
and undirected edges at the same time. If no direction is specified
when an edge is declared, the default direction is applied to the edge.
The default direction is declared as the XML Attribute edgedefault of
the graph element. The two possible value for this XML Attribute are
directed and undirected. Note that the default direction must be
specified.

However, when specifying an edgedefault Gephi complains "Edge type doesn't
fit with default".

More importantly having a graph with `edgedefault="undirected"` but all edges
but one with `directed="true"` makes the unspecified edge directed as well. My
work around for now is to just not specify edgedefault for the graph, and manually
specifying `directed` as `true` or `false` for each edge - even though this doesn't
strictly follow the GraphML spec.