OntoME

Subclass of:

• E1 CRM Entity

Superclass of:

• D9 Data Object

Scope note:

This class comprises quantifiable properties that can be measured by some calibrated means and can be approximated by values, i.e. points or regions in a mathematical or conceptual space, such as natural or real numbers, RGB values etc. An instance of E54 Dimension represents the true quantity, independent from its numerical approximation, e.g. in inches or in cm. The properties of the class E54 Dimension allow for expressing the numerical approximation of the values of an instance of E54 Dimension. If the true values belong to a non-discrete space, such as spatial distances, it is recommended to record them as approximations by intervals or regions of indeterminacy enclosing the assumed true values. For instance, a length of 5 cm may be recorded as 4.5-5.5 cm, according to the precision of the respective observation. Note, that interoperability of values described in different units depends critically on the representation as value regions. Numerical approximations in archaic instances of E58 Measurement Unit used in historical records should be preserved. Equivalents corresponding to current knowledge should be recorded as additional instances of E54 Dimension as appropriate.

Examples:

• currency: £26.00
• length: 3.9-4.1 cm 
• diameter 26 mm
• weight 150 lbs
• density: 0.85 gm/cc
• luminescence: 56 ISO lumens
• tin content: 0.46 %
• taille au garot: 5 hands
• calibrated C14 date: 2460-2720 years, etc

In First Order Logic:

• E54(x) ⊃ E1(x)

Ongoing properties:

• P90 has value → E60 Number
• P91 has unit → E58 Measurement Unit

Incoming properties:

• E16 Measurement → P40 observed dimension
• E52 Time-Span → P83 had at least duration
• E52 Time-Span → P84 had at most duration
• E70 Thing → P43 has dimension