Both directions of the NWB<->GraphML converter are faulty or fail to provide key features (preservation of metadata).
Logged In: YES
Some of this is because the GraphML to NWB converter uses Jung's (noncompliant) GraphML capabilities internally. If we're going to go through an intermediate step, we should do so explicitly (write a Jung -> NWB converter, not a GraphML -> NWB converter that uses Jung), or write a real converter. An XSLT stylesheet might make sense for this, given its a transformation from XML to a text format.