The following diagram visualizes the data sets in the LOD cloud as well as their interlinkage relationships. Each node in this cloud diagram represents a distinct data set published as Linked Data. The arcs indicate that RDF links exist between items in the two connected data sets. Heavier arcs roughly correspond to a greater number of links between two data sets, while bidirectional arcs indicate the outward links to the other exist in each data set.
There is a section in the document focusing on compliance with best practices for data provisioning that is a detailed explanation of the Sir Tim Berners-Lee 5-star deployment scheme for linked open data
Original title and link: State of the Linking Open Data Cloud (NoSQL databases © myNoSQL)