By Javier Nogueras-Iso
Metadata play a primary position in either DLs and SDIs. regularly outlined as "structured information approximately facts" or "data which describe attributes of a source" or, extra easily, "information approximately data", it really is a necessary requirement for finding and comparing to be had facts. for this reason, this booklet makes a speciality of the research of alternative metadata facets, 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 data retrieval innovations to the invention companies of geographic information catalogs (contributing during this strategy to keep away from metadata content material heterogeneity).
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