Linked data project teams should consider enhancing their source data with links to other published linked data sets in order to provide added value to users. These types of links are encouraged in Tim Berners-Lee's description of 5 star open data that encourages linked data creators to "link your data to other people's data to provide context"(Berners-Lee, 2009). Providing links to URIs from other linked data sets also allows users of your data to easily supplement your data with properties from any of the data sets to which links are provided. The NCSU project team chose to make these links using the "sameAs" property from the OWL vocabulary, which "indicates that two URI references actually refer to the same thing" (Dean&Schreiber, 2004).The NCSU project team initially selected the Virtual International Authority File (http://viaf.org/), the Library of Congress Linked Data Service (http://id.loc.gov/), and the International Standard Name Identifier (http://www.isni.org) as good sources of linked data identifiers for the organizations in our data set. To broaden our scope and provide access to non-library-oriented information, we also included links to Freebase (http://www.freebase.com/) and DBpedia (http://dbpedia.org/), which presents Wikipedia information as linked data. The Virtual International Authority File (VIAF) was particularly efficient for linked data searching because in addition to VIAF identifiers, it also provided access to identifiers that could be used to generate URIs for the Library of Congress Linked Data Service and the International Standard Name Identifier (ISNI).For example, by finding the LC control number for "Yankee Book Peddler Inc." (no96044483) in a VIAF entry, it was easy to generate the full URI for "Yankee Book Peddler Inc." on the Library of Congress Linked Data Service
(http://id.loc.gov/authorities/names/no96044483).