® Hosted and Sponsored by W3C Provenance Working Group Update 80th OGC Technical Committee Austin, Texas (USA) Carl Reed March 20, 2012 Copyright © 2012 Open Geospatial Consortium

OGC ® W3C Provenance Working Group Mission To support the widespread publication and use of provenance information of Web documents, data, and resources. The Working Group will publish W3C Recommendations that define a language for exchanging provenance information among applications. Copyright © 2012 Open Geospatial Consortium

OGC ® Work program Developing a set of specifications aiming to define the various aspects that are necessary to achieve the vision of interoperable interchange of provenance information in heterogeneous environments such as the Web. –Primer –Provenance Data Model –Provenance Ontology Copyright © 2012 Open Geospatial Consortium

OGC ® Provenance Data Model The things that one may ask the provenance of are called entities. Examples of such entities are a web page, a chart, and a spellchecker. Activities are how entities come into existence and how their attributes change to become new entities Copyright © 2012 Open Geospatial Consortium

OGC ® Provenance Ontology The PROV Ontology (also PROV-O) encodes the PROV Data Model in the OWL2 Web Ontology Language (OWL2). The PROV ontology consists of a set of classes, properties, and restrictions that can be used to represent provenance information. The PROV ontology can also be specialized to create new classes and properties for modeling provenance information specific to different domain applications. The PROV ontology supports a set of entailments based on OWL2 formal semantics and provenance specific inference rules. Copyright © 2012 Open Geospatial Consortium

OGC ® Prov:location A location can be an identifiable geographic place (ISO 19112), but it can also be a non-geographic place such as a directory, row, or column. As such, there are numerous ways in which location can be expressed, such as by a coordinate, address, landmark, and so forth. This document does not specify how to concretely express locations, but instead provide a mechanism to introduce locations, by means of attributes. –The attribute prov:location is an optional attribute of entity and activity. The value associated with the attribute prov:location must be a PROV-DM Literal, expected to denote a location. –The following expression describes entity Mona Lisa, a painting, with a location attribute. entity(ex:MonaLisa, [prov:location="Le Louvres, Paris", prov:type="StillImage"]) Copyright © 2012 Open Geospatial Consortium