On 16 Jan 2020, at 18:15, Martin Doerr <[email protected]> wrote:
On 1/16/2020 3:10 PM, Bekiari Xrysoula wrote:
Dear Martin
We would like to remind you the HW on issue 431. You may find the details in
http://www.cidoc-crm.org/Issue/ID-431-make-methodology-clear
all the best
Chryssoula - Eleni
Dear All,
Here my proposal, in italics the additions, at three places:
Class
A class is a category of items that share one or more common traits serving as
criteria to identify the items belonging to the class. These properties need
not be explicitly formulated in logical terms, but may be described in a text
(here called a scope note) that refers to a common conceptualisation of domain
experts. The sum of these traits is called the intension of the class and
constitute its definition. In the CRM, a class is identified by an alphanumeric
code and a name, for mnemonic reasons, which should not be regarded as
definition. A class may be the domain or range of none, one or more properties
formally defined in a model. The formally defined properties need not be part
of the intension of their domains or ranges: such properties are optional. An
item that belongs to a class is called an instance of this class. A class is
associated with an open set of real life instances, known as the extension of
the class. Here “open” is used in the sense that it is generally beyond our
capabilities to know all instances of a class in the world and indeed that the
future may bring new instances about at any time (Open World). Therefore a
class cannot be defined by enumerating its instances. A class
plays a role analogous to a grammatical noun, and can be completely defined
without reference to any other construct (unlike properties, which must have an
unambiguously defined domain and range). In some contexts, the terms individual
class, entity or node are used synonymously with class.
For example:
E21 Person is a class. To be a person may actually be determined by DNA
characteristics, but we all know what a person is. The scope note of E21 Person
clarifies the exact sense of this class in contrast to other possible meanings
of ‘person’ in natural languages. A person may have the property of being a
member of a Group, but it is not necessary to be member of a Group in order to
be a Person. We shall never know all persons of the past. There will be more
persons in the future.
scope note
A scope note is a textual description of the intension of a class or property.
Scope notes are not formal modelling constructs, but are provided to help
explain the intended meaning and application of the CIDOC CRM’s classes and
properties. Basically, they refer to a conceptualisation common to domain
experts and disambiguate between different possible interpretations. They
constitute approximate definitions. The name of a class is a mnemonic help for
the content of the scope note and not part of the definition. Illustrative
example instances of classes and properties are also regularly provided in the
scope notes for explanatory purposes.
Naming Conventions
The following naming conventions have been applied throughout the CIDOC CRM:
· Classes are identified by numbers preceded by the letter “E” (historically classes were sometimes referred to as “Entities”), and are named using noun phrases (nominal groups) using title case (initial capitals) as mnemonics for the content of the scope note. For example, E63 Beginning of Existence.
· Properties are identified by numbers preceded by the letter “P,” and are
named in both directions using verbal phrases in lower case as mnemonics for
the content of the scope note. Properties with the character of states are
named in the present tense, such as “has type”, whereas properties related to
events are named in past tense, such as “carried out.” For example, P126
employed (was employed in).
--
------------------------------------
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)
N.Plastira 100, Vassilika Vouton,
GR70013 Heraklion,Crete,Greece
Vox:+30(2810)391625
Email:
[email protected]
Web-site:
http://www.ics.forth.gr/isl
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