For some reason you neglect to mention RDF graph data model and its SPARQL query language, which have been W3C standards since 1997 and 2008, respectively.
They have a healthy ecosystem of both open-source and commercial software, and unlike property graphs were designed with data interchange in mind from the outset.
SPARQL was the first and still is the only standard NoSQL query language.
They have a healthy ecosystem of both open-source and commercial software, and unlike property graphs were designed with data interchange in mind from the outset.
SPARQL was the first and still is the only standard NoSQL query language.