The Health Care Cost Institute (HCCI) is a new non-profit research institute and a unique and unprecedented health research partnership. Its mission is to promote independent research and analysis on the causes of rising US health spending, to provide policy makers, consumers, and researchers with better, more transparent information on what is driving health care costs, to help ensure that, over time, the nation is able to get greater value from its health spending.

This document describes R2RML, a language for expressing customized mappings from relational databases to RDF datasets. Such mappings provide the ability to view existing relational data in the RDF data model, expressed in a structure and target vocabulary of the mapping author's choice. R2RML mappings are themselves RDF graphs and written down in Turtle syntax. R2RML enables different types of mapping implementations. Processors could, for example, offer a virtual SPARQL endpoint over the mapped relational data, or generate RDF dumps, or offer a Linked Data interface.

The need to share data with collaborators motivates custodians and users of relational databases (RDB) to expose relational data on the Web of Data. This document defines a direct mapping from relational data to RDF. This definition provides extension points for refinements within and outside of this document.

ontologies

Visor is a Linked Data browser which enables end-user exploration and data querying. It is configurable for any SPARQL endpoint. This demonstrator version shows Visor using the DBPedia dataset, which contains data extracted from Wikipedia.