The 9 EDCS Dictionaries continued

• Unit Dictionary - the unit of measurement of a real valued attribute
  • A precisely specified quantity in terms of which the magnitudes of other quantities of the same kind can be stated. (METRE, PASCAL, KELVIN, …)
  • Used to specify real value types.

• Unit Equivalence Class Dictionary - equivalence classed of EUs which measure the same quantity
  • A partitioning of units of measure into a set, where members of a set measure the same physical quantity. (MASS, LENGTH, VOLUME, …)

• Unit Scale Dictionary - the scale factor to be used with an EU
  • A multiplicative constant applied to a unit of measure in order to avoid both excessively large or small attribute values. (KILO, MILLI, NANO, …)

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