[igraph] igraph as a graph database

[Massimo Franceschet]

Is it possible to use igraph as a graph database, like neo4j for instance? 
In particular, I would like to encode in igraph a property graph, which is a 
graph in which nodes and edges have their own properties. An example: 
http://inserpio.wordpress.com/information-technology/neo4art-van-goghs-journey/
I tried but immediately noticed that attributes in igraph are 'global', that 
is, you can set them for all nodes or edges, not for a subset of them, like 
nodes or edges of a given type. Since igraph have great analysis capabilities 
(which in general graph databases like neo4j do not have), it would be very 
useful to encode property graphs in igraph as well, and possibly have a simple 
query language for them.