designing uri sets for inspire john goodwin senior research scientist (and chair of uklp linked data...
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Designing URI Sets for INSPIRE
John Goodwin
Senior Research Scientist (and Chair of UKLP Linked Data Working Group)
30 May 2012
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Linked Data
Linked Data:
• Use URIs to identify things.
• Use HTTP URIs so that these things can be referred to and looked up ("dereferenced") by people and user agents.
• Provide useful information about the thing when its URI is dereferenced, using standard formats such as RDF/XML.
• Include links to other, related URIs in the exposed data to improve discovery of other related information on the Web.
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Identifying Things with URIs
• Use HTTP URIs to identify things, e.g. people, places, organisations
“John Goodwin”
http://www.johngoodwin.me.uk/me
“The City of Southampton”
http://data.ordnancesurvey.co.uk/id/7000000000037256
“Ordnance Survey”
http://reference.data.gov.uk/id/department/os
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Making These URIs Dereferencable
http://data.ordnancesurvey.co.uk/id/7000000000037256
http://data.ordnancesurvey.co.uk/doc/7000000000037256
http://data.ordnancesurvey.co.uk/doc/7000000000037256.rdf
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Making These URIs Dereferencable
URI identifying the City of Southampton:http://data.ordnancesurvey.co.uk/id/7000000000037256
URI identifying the document describing the City of Southampton:http://data.ordnancesurvey.co.uk/doc/7000000000037256
URI identifying the HTML document describing the City of Southampton:
http://data.ordnancesurvey.co.uk/doc/7000000000037256.html
URI identifying the RDF document describing the City of Southampton:
http://data.ordnancesurvey.co.uk/doc/7000000000037256.rdf
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INSPIRE
The EU INSPIRE Directive calls for
• “a common framework for the unique identification of spatial objects, to which identifiers under national systems can be mapped in order to ensure interoperability between them”
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Spatial Things and Spatial Objects
Term Definition Source
Spatial Thing “Anything with spatial extent, i.e. size, shape, or position. e.g. people, places, bowling balls, as well as abstract areas like cubes.”
Spatial-Things are that subset of 'real-world phenomena' which relate to a location.
W3C “WGS84 Geo Positioning: an RDF
vocabulary”
Spatial Object An abstract representation of a real-world phenomenon related to a specific location or geographical area. This INSPIRE term is synonymous with the ISO 19100 term "(geographic) feature", and distinct from ISO "spatial object", which specifically contains the positional information for a feature.
INSPIRE Glossary item 67
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Spatial Things and Spatial Objects
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URI Sets
• “A collection of reference data published using URIs, about a single concept, governed from a single source.”
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Identity
Term Definition Source
Unique Object Identifier Identifier associated with a spatial object
INSPIRE Glossary Item 77
Thematic Identifier Descriptive unique object identifier applied to spatial objects in a defined information theme
E.g. an administrative code for administrative area spatial objects in the administrative units theme, a parcel code for parcel spatial objects in a cadastral theme
INSPIRE Glossary item 73
Geographic Identifier spatial reference in the form of a label or code that identifies a location [ISO 19112] E.g. Postal codes: 53115, 01009, SW1, IV19 1PZ
INSPIRE Glossary item 32
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Unique Object Identifiers
• namespace – intended as a unique identifier prefix to enable delegated administration of local identifier within a framework of globally unique identifiers.
• localId – a character string that is unique within a given namespace such that the combination of namespace name and localId form a globally unique spatial-object identifier (i.e. consistently identifies the same spatial-object).
• versionId – an optional component that is used to distinguish between multiple versions of a spatial object designated by a namespace/localId combination. A versionId is unique within the scope of a given namespace/localId combination ie. within the scope of a given namespace/localId, a versionId consistently designates a single version of the spatial-object that corresponds to the given namespace/localId.
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URIs for Spatial Things
http://{your domain}/id/[{concept}]/{reference}
http://{sector}.data.gov.uk/id/{concept}/{reference} [/{version}]
http://location.data.gov.uk/id/{theme}/{concept} [/{codeset}]/{reference}[/{version}]
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Examples of URIs for Spatial Things
http://data.ordnancesurvey.co.uk/id/7000000000037256
http://environment.data.gov.uk/id/bathing-water/ukk2302-35600
http://transport.data.gov.uk/id/station/MAN
http://location.data.gov.uk/id/tn/station/crs/MAN
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URIs for Spatial Objects
http://location.data.gov.uk/so/{theme}/{class}/ {namespace}/{localId}[/{versionId}]
http://{authority}/so/{theme}/{class}/{namespace}/ {localId}[/{versionId}]
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Example of URIs for Spatial Object
http://location.data.gov.uk/so/ef/SamplingPoint/bwsp.eaew/35600
http://location.data.gov.uk/so/tn/RailwayStationNode/nwkr/123456
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URIs for documents describing spatial things
http://{your domain}/doc/[{concept}]/{reference} [[.|/]{rendition}]
http://{sector}.data.gov.uk/doc/{concept}/{reference} [/{version}][[.|/]{rendition}]
http://location.data.gov.uk/doc/{theme}/{concept} [/{codeset}]/{reference}[/{version}] [[.|/]{rendition}]
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URIs for document describing spatial objects
http://location.data.gov.uk/doc/{theme}/{class}/ {namespace}/{localId}[/{versionId}] [[.|/]{rendition}]
http://{authority}/doc/{theme}/{class}/{namespace}/ {localId}[/{versionId}][[.|/]{rendition}]
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URIs for Classes and Properties
URIs for classes:
http://location.data.gov.uk/def/{theme}[/{package}] [/{concept|class}][/{version}]/{class}
URIs for Open Domain Properties:
http://location.data.gov.uk/def/{theme}[/{package}] [/{concept|class}][/{version}]/{property}
URIs for Closed Domain Properties:
http://location.data.gov.uk/def/{theme}[/{package}] [/{concept|class}][/{version}]/{class}/{property}
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Acknowledgements
• Stuart Williams
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Discussion
• Early days yet – so seeing how this works
• Does the ‘linked data way’ fit with the ‘INSPIRE way’ ?
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Representing Geometry: GeoSPARQL
“The goal for the OGC GeoSPARQL standard is to support representing and querying geospatial data on the Semantic Web. GeoSPARQL defines a vocabulary for representing geospatial data in RDF, and it defines an extension to the SPARQL query language for processing geospatial data. “
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Contact for further information
John Goodwin
Customer Service CentreOrdnance SurveyAdanac DriveSOUTHAMPTONUnited KingdomSO16 0AS
Phone: +44 (0)8456 05 05 05
Fax: +44 (0)8450 990494
www.ordnancesurvey.co.uk