It is said, in this presentation (http://www.slideshare.net/FernandaFaini/presentazione-open-gov-open-data-forum-pa ) on page 23 and 24, that the "Linked Open Data (5 stars) have in the structure of the dataset links to other datasets (Linked RDF). "

From here, in my opinion, you can 'leave and go further:

- Then categorize the linked open data with descriptive metadata of the published tables and fields, adding the sixth star, which brings us to the level LOM (Linked Open Metadata) - Then, with the use of lightweight ontologies, or conceptual schemes with hierarchies of entities 'relationships and infer knowledge for similarity in the descriptive metadata of tables and fields, thus achieving' the seventh star that leads us to level LOMO (Linked Open Metadata ontologies)

To get to accomplish all of this in the public administration, a way can 'be the one described in my previous article on this:

http://nelfuturo.com/wp-content/uploads/pdf/paper02-extended-draft.pdf