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Sigma KEE - uniqueIdentifier
The class of
that uniquely identify an instance of
. Some examples of
s are the keys of tables in database applications and the ISBN (International Standard Book Number).
?STRING ?ENTITY) means that the thing ?ENTITY has the
?STRING as its name. Note that
are the two immediate
. The predicate
is used when the referring item is merely a tag without connotative content, while the predicate
is used for referring items that have such content.
Properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment.
relating two items - its valence is two.
s are relations that are true only of pairs of things.
s are represented as slots in frame systems.
La clase universal de individuos. Es el nodo principal de la ontología.
The class of
s whose properties can be inherited downward in the class hierarchy via the
just in case it is not a
, i.e. just in case assigning values to every argument position except the last one does not necessarily mean that there is a value assignment for the last argument position. Note that, if a
is both a
, then it is a partial function.
is a sentence-forming
. Each tuple in the
is a finite, ordered sequence of objects. The fact that a particular tuple is an element of a
is denoted by '(*predicate* arg_1 arg_2 .. arg_n)', where the arg_i are the objects so related. In the case of
s, the fact can be read as `arg_1 is *predicate* arg_2' or `a *predicate* of arg_1 is arg_2'.
of relations. There are two kinds of
s both denote sets of ordered n-tuples. The difference between these two
es is that
s cover formula-forming operators, while
s cover term-forming operators.
just in case an assignment of values to every argument position except the last one determines at most one assignment for the last argument position. Note that not all
Belongs to Class
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