Metadata comprises data and other documentation that describes objects in a formalised way (Economic Commission for Europe of the United Nations (UNECE), Terminology on Statistical Metadata, Conference of European Statisticians Statistical Standards and Studies, No. 53, Geneva, 2000, <a href="http://www.unece.org/stats/publications/53metadaterminology.pdf)Metadata">http://www.unece.org/stats/publications/53metadaterminology.pdf)Metadata</a> provide information on data and about pr