The database contains the class and property definitions as contained in IEC 61360-4:1997 together with all additions and amendments that have been proposed for it or are undergoing evaluation. The dictionary and database follow the methodology of Part 1 of IEC 61360 and the information model of Parts 2 and 5, and include: - a hierarchical classification of components in a classification tree - a set of characteristic properties (DETs) associated with each class that fully describe components belonging to a class. Within the classification hierarchy, sub-classes inherit properties from those classes above them in the tree - where relevant, conditions or value ranges for which the property values are valid. These characteristic properties may be used in specifications, data sheets, or requirement documents to unambiguously describe physical or virtual products. Users may use the properties to create special lists of properties to characterize products in a commonly agreed way. IEC CDD data can be extracted in a IEC 62656-1 compliant computer-sensible form. Selective downloads are available in Excel format.