Most NoSQL systems are schema-on-read: data can be stored without first having to declare
a schema that imposes a structure. This schemaless feature offers flexibility to evolve data-
intensive applications when data change frequently. However, freeing from declaring
schemas does not mean their absence, but rather that they are implicit in data and code.
Therefore, diagramming tools similar to those available for relational systems are also
needed to help developers and administrators to design and to understand NoSQL …