Paul wrote: "Now what puzzles me is that Event is defined as a subClass of
----- Original Message -----
Sent: Wednesday, December 15, 2010 6:11
Subject: [ontolog-forum] problem
understanding subClass used
I'm just a novice in this area and I'm trying to learn from existing
The ontology I'm studying now is about Cultural Heritage.
In this ontology there is a class "Event" with definition
"This class comprises changes of states in cultural, social or physical
systems, regardless of scale,
brought about by a series or group of coherent physical, cultural,
technological or legal phenomena."
"the Yalta Conference", "the birth of Cleopatra", "my car accident of
last friday", "the big bang"
A second class is "Period" with definition
"This class comprises sets of coherent phenomena or cultural
manifestations bounded in time and space.
It is the social or physical coherence of these phenomena that identify a
"European Bronze Age", "Italian Renaissance".
Now what puzzles me is that Event is defined as a subClass of
So "the Yalta Conference", "the birth of Cleopatra", "my car accident of
last friday", "the big bang" all become instances of Period.
The rationale for doing this according to the ontology:
"The distinction between an Event and a Period is partly a question of
the scale of observation.
Viewed at a coarse level of detail, an Event is an "instantaneous" change
At a fine level, the Event can be analyzed into its component phenomena
within a space and time frame, and as such can be seen as a Period."
I still find it difficult to consider something that instantaneous
changes state is automatically and at the same time something stable and
Any pointers or explanations that can further enlighten me?
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