Chronometric dating technique
Note that the standard interval calculus assumes all intervals are proper, so their beginning and end are different., support the association of temporal information with any temporal entity, such as an activity or event, or other entity.
In order to support these more general applications, the representation of temporal position and duration must be flexible, and annotated with the in use. named dynasties, geological periods, geomagnetic reversals, tree rings) can make a simple form of temporal reference system that supports logical reasoning, known as an .In scientific and technical applications, Julian date counts the number of days since the beginning of 4713 BCE, and Loran-C, Unix and GPS time are based on seconds counted from a specified origin in 1958, 19, respectively, with GPS time represented using a pair of numbers for week number plus seconds into week.Archaeological and geological applications use chronometric scales based on years counted backwards from ‘the present’ (defined as 1950 for radiocarbon dating ).The table below indicates the full list of namespaces and prefixes used in this document. This idea - that time intervals are the more general case and time instants are just a limited specialization - is the first key contribution of Allen's analysis.The class and identity on the beginning and end points.These provide a standard way to attach time information to things, which may be used directly in applications if suitable, or specialized if needed.
] style notation, but ignoring leap seconds, which are explicitly mandated by the international standard.
In its most general form a clock is just a regularly repeating physical event ('tick') and a counting mechanism for the 'ticks'.
These counts may be used to logically relate two events and to calculate a duration between the events.
It focusses particularly on temporal ordering relationships.
While these are implicit in all temporal descriptions, OWL-Time provides specific predicates to support, or to make explicit the results of, reasoning over the order or sequence of temporal entities.
OWL-Time is an OWL-2 DL ontology of temporal concepts, for describing the temporal properties of resources in the world or described in Web pages.