CR: Time Ontology in OWL

Time Ontology in OWL

https://www.w3.org/TR/2020/CR-owl-time-20200326/

feedback due by: 2020-04-23

Abstract

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. The ontology provides a vocabulary for expressing facts about topological (ordering) relations among instants and intervals, together with information about durations, and about temporal position including date-time information. Time positions and durations may be expressed using either the conventional (Gregorian) calendar and clock, or using another temporal reference system such as Unix-time, geologic time, or different calendars. 

The namespace for OWL-Time terms is http://www.w3.org/2006/time# 

The suggested prefix for the OWL-Time namespace is time 

The OWL-Time ontology is available here. 

An ontology of individuals for the Gregorian calendar (months) is available here.

Status of the Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at https://www.w3.org/TR/. 

For OGC - This is a Public Draft of a document prepared by the Spatial Data on the Web Working Group (SDWWG) — a joint W3C-OGC project (see charter). The document is prepared following W3C conventions. Comments regarding this document are welcome - please submit them in the issue tracker. Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation. 

New classes and properties are introduced in this revision of OWL-Time. The new elements primarily relate to relaxing the limitation that time position uses only the Gregorian Calendar, and are placed in a logical hierarchy in relation to the original elements. While there is less implementation evidence for these than the elements from the 2006 version, the new elements are essential to satisfying key requirements in the revision. 

However, a small number of other new elements merit additional explanation:  :hasXSDDuration allows use of the compact xsd:duration element to describe the extent of a temporal entity. This complements existing predicates used with XSD datatypes, and was an inexplicable omission from the original ontology. :MonthOfYear and :monthOfYear complement :DayOfWeek and :dayOfWeek to support vernacular names for months as well as days. :hasTime is a completely generic predicate for associating a temporal entity with anything. A number of generic predicates suitable for use directly in applications were requested, but in general were deemed undesirable in an ontology dealing with the description of time elements rather than their use. This one only was included for users unwilling or unable to define their own semantics. 

This document was published by the Spatial Data on the Web Working Group as a Candidate Recommendation. This document is intended to become a W3C Recommendation.

Comments regarding this document are welcome. Please send them to public-sdw-comments@w3.org (archives).

W3C publishes a Candidate Recommendation to indicate that the document is believed to be stable and to encourage implementation by the developer community. This Candidate Recommendation is expected to advance to Proposed Recommendation no earlier than 23 April 2020.

Please see the Working Group's implementation report.

Publication as a Candidate Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

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This document is governed by the 1 March 2019 W3C Process Document.

Received on Thursday, 26 March 2020 16:02:34 UTC