Issue 293: Dimension
Posted by Martin on 7/10/2015
Following todays discussion about business transactions we'll report later, it appears that the examples of E54 are not consistent:
Subclass of: E1 CRM Entity
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.
§ 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
An instance of E54 should for instance be : "silver cup 232 height (E54)" as in P40.
In the 36th joined meeting of the CIDOC CRM SIG and ISO/TC46/SC4/WG9 and the 29th FRBR - CIDOC CRM Harmonization meeting, the crm-sig discussed about the comment of the last meeting that an instance of the dimension is NOT the unit and amount but the actual dimension of a thing, assigned HW to GB to propose new examples by Thursday. Also it is mentioned that currently E16 Measurement can be used for measuring an instance of E1 CRM Entity BUT this is inconsistent with S4 Observation.O8 observed: S15 Observable Entity which is narrower since S4 Observation is superclass of E16 Measurement. Current definition of E16 Measurement gives unintended models. This incompatibility could be resolved by moving S15 Observable Entity in CIDOC CRM core. The sig assigned HW to MD, CEO, Oyvind to work on this issue. MD will make proposal. Must consider what is not observable. To be considered at next SIG
posted by George on 21/10/2016
Examples for Dimension
The 250 metric ton weight of the Luxor Obelisk
The 5.17 m height of the statue of David by Michaelangelo
The 530.2 carats of the Great Star of Africa diamond
The AD1262-1312, 1303-1384 calibrated C14 date for the Shroud of Turin
The 33 m diameter of the Stonehenge Sarcen Circle
The 755.9 foot length of the sides of the Great Pyramid at Giza
In the 37th joined meeting of the CIDOC CRM SIG and ISO/TC46/SC4/WG9 and the 30th FRBR - CIDOC CRM Harmonization meeting, the crm-sig accepted the examples provided by GB. It remain open the homework assignment of MD,CEO,Oyvind about moving S15 Observable entity to CIDOC CRM.
Berlin, December 2016