>>A necessary condition for the network effect to take off in the noSQL database market is the availability of a common abstract mathematical data model and an associated query language for noSQL that removes product differentiation at the logical level and instead shifts competition to the physical and operational level.

A common abstract mathematical data model is Graphs.

The associated query language is any of the declarative graph query languages (see openCypher for example @ http://www.opencypher.org/ ).