This standard specifies principles for the definition of the properties and associated attributes and explains the methods for representing verbally defined concepts with appropriate data constructs available from IEC 61360-2. It also specifies principles for establishing a hierarchy of classification from a collection of classes, each of which represents a technical concept in electrotechnical domain or a domain related to electrotechnology. The use of this standard facilitates the exchange of technical data through a defined structure for the information to be exchanged in a computer-sensible form. Each property to be exchanged will have an unambiguously defined meaning and consistent naming, where relevant a defined value list, a prescribed format and defined units of measure for all quantitative values. There is also provision for: " control of changes to definitions of the properties through version and revision numbers; " inclusion of notes and remarks to clarify and help in the application of the definitions; " indication of the sources of definitions and value lists; " associated figures and formulae. NOTE 2 IEC TCs and SCs, or other organizations can take this part of IEC 61360 as a basis for the development of their own dictionaries. Out of scope of this part are subjects concerning the Information Technology infrastructure such as: " security; " database locking mechanisms; " access rights management.