By Nogueras-Iso J., Muro-Medrano P., Zarazaga-Soria J.
Metadata play a primary position in either DLs and SDIs. in general outlined as "structured facts approximately facts" or "data which describe attributes of a source" or, extra easily, "information approximately data", it really is a vital requirement for finding and comparing on hand info. accordingly, this publication specializes in the examine of alternative metadata points, which give a contribution to a extra effective use of DLs and SDIs. the 3 major matters addressed are: the administration of nested collections of assets, the interoperability among metadata schemas, and the mixing of knowledge retrieval options to the invention prone of geographic info catalogs (contributing during this technique to steer clear of metadata content material heterogeneity).