Hello I doubt that CLEREZZA-715 and its resolution are correct. IIUC the default graph is the union of the all the other triple collection. As some of these are mutable the content of the default graph doesn't stay constant as this is required for graph instances (for their hashCode and equals method to be usefull), for this reason I think it should be a (read-only) MGraph rather than a Graph,
Cheers, Reto
