Martin,
I'm not sure I particularly like the phrase 'identifiers in continua' - but
maybe I just don't understand its intended meaning. To me, a date is just a
data value, expressed to a certain degree of precision. An 'identifier'
suggests something which is deliberately assigned as a property of an entity,
in order to ... identify it.
In any case, if we are defining and giving examples of these identifiers,
shouldn't we be doing so within the class descriptions where this concept
applies, not in one where we specifically say that it doesn't apply?
Whatever these identifiers are, they won't be E50 or E47, both of which are
flagged as deprecated (and now to be treated as E41 Appellation).
Richard
On 08/10/2019 17:59, Martin Doerr wrote:
Dear All, we need to provide other definitions of identifiers in continua.
E60 Number
Subclass of: E59 Primitive Value
Scope Note: This class comprises any encoding of computable (algebraic)
values such as integers, real numbers, complex numbers, vectors, tensors etc.,
including intervals of these values to express limited precision.
Numbers are fundamentally distinct from identifiers in continua, such as
instances of E50 Date and E47 Spatial Coordinate, even though their encoding
may be similar. Instances of E60 Number can be combined with each other in
algebraic operations to yield other instances of E60 Number, e.g., 1+1=2.
Identifiers in continua may be combined with numbers expressing distances to
yield new identifiers, e.g., 1924-01-31 + 2 days = 1924-02-02. Cf. E54 Dimension
Examples:
§ 5
§ 3+2i
§ 1.5e-04
§ (0.5, - 0.7,88)
In First Order Logic:
E60(x) ⊃ E59(x)
--
------------------------------------
Dr. Martin Doerr
Honorary Head of the
Center for Cultural Informatics
Information Systems Laboratory
Institute of Computer Science
Foundation for Research and Technology - Hellas (FORTH)
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GR70013 Heraklion,Crete,Greece
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Email: [email protected]<mailto:[email protected]>
Web-site: http://www.ics.forth.gr/isl
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