Here my homework!
The sig discussed Martin's proposal about the relaxation of definition of E54 to either representing the approximation of a true quantity of a thing or phenomenon provided by a measurement or a derived quantity computed indirectly from observation data comparable to reality, or a quantity produced by simulation of reality-like situations.
Some comments are:
· the phrase "An instance of E54 Dimension is specific to an instance of E70 Thing" in the scope note of P43 is too specific and it is not compatible with the above approach. There are some consequences of this approach.
· We should consider the properties of a physical thing.
A conclusion was that closeness or overlap of given bounds of approximation are the means to reason on the compatibility with a common reality or item. Arrays and time series are regarded as “complex” dimensions.
The SIG assigned to MD to rewrite the scope note of E54.
Subclass of: CRM Entity
Scope note: This class comprises quantifiable properties of things or phenomena 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 may represent either the result of a measurement of a quantity of some things or phenomena, or the result of an evaluation of observation data indirectly determining an approximation of such a quantity, or the result of a prediction or hypothetical simulation of such a quantity in a scenario of a possible or alternative evolution of reality. Quantifiable properties of conceptual objects are observed on representative carriers. Not only dimensions of persistent items can be quantifiable, but also durations, spatial and temporal distances of instances of E2 Temporal Entities.
Most quantifiable properties change over time and have a continuous value space. Therefore, multiple observations will differ from each other, but knowledge about the precision of the respective determination method and domain knowledge about the changes to be expected between observations allow for reasoning which results of multiple observations are compatible with a common reality and can be used for further approximating the real quantities. For instance the weight of a person varies in the course of the day in a kg range. Wood expands under humidity some per cents, metal much less under increasing temperature. Instances of E54 Dimensions are specific to the way a property is determined. For instance, the length of a museum objects determined by the smallest rectangular bounding box is different from the maximum length of the object.
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
space, such as spatial distances, it is recommended to record
approximations by intervals or regions of indeterminacy
enclosing the assumed
true values. For instance, a length of 5 cm may be recorded as
according to the precision of the respective observation.
interoperability of values described in different units
depends critically on
the representation as value regions. For instance, 5cm is
about 1.96850394 inches. 2 inches
on the other side may be interpreted as something between
1.5-2.5 inches, which would be something within 3.5-6.5 cm.
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.
§ 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
§ Christies’ hammer price for “Vase with Fifteen Sunflowers” (E97) has currency British Pounds (E98)
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