This repository is for discussion and development of standards, best practices, and tools for using Extended Date/Time Format (EDTF) in RDF and OWL.
Currently it contains:
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A draft ontology extending the Time Ontology to model EDTF concepts
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A set of Turtle files using this ontology to model the different examples from the EDTF specification for EDTF level 0, level 1, and level 2.
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Notation3 rules for automatically inferring Time Ontology constructs from EDTF strings
Initially we just hope to reach consensus on how EDTF maps onto the Time Ontology.
Future work may include:
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Standards for linking datatypes to rules for expanding them into subgraphs, so that non-EDTF aware tools can process EDTF (see David Booth's speculation about “rich literals”)
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Mapping to other temporal ontologies such as CIDOC-CRM
See the discussions for more.