How to publish local metadata as linked data Gordon Dunsire Presented at Linked Open Data: current...
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![Page 1: How to publish local metadata as linked data Gordon Dunsire Presented at Linked Open Data: current practice in libraries and archives (3rd Linked Open.](https://reader036.fdocuments.us/reader036/viewer/2022062404/5517662b55034645368b48d8/html5/thumbnails/1.jpg)
How to publish local metadata as linked data
Gordon DunsirePresented at Linked Open Data: current practice in libraries and archives (3rd Linked Open Data
Conference), Edinburgh, 18 Nov 2013
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Overview
Choosing and finding elements for publishing linked dataLosing data; dumbing down
Creating local elementsCase study: NLS DOD
Developing local elements and URIsExtracting data triplesDemo of proof-of-concept interface
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Choosing elements
Classes (types) and properties (attributes and relationships) that represent the context and scope of linked dataElements should be available to applications
“Global” element >= local element [meaning/semantic]< results in semantic incoherency + low trust/quality
rating> results in loss of precision, loss of information
“dumbing down” (Dublin Core)
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Finding elements
Pick and mixMany element sets for bibliographic data are
availableGeneral: Dublin Core, FOAF, SKOS …Specific: BibO, FRBR, ISBD, RDA …
With significant overlap …Shades of meaning = semantic granularity
Searchable registries: joinup, LOV, OMR …Or grow your own
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Creating elements
Structure of local records derived from a local schemaHome grown or modified standard
Simple methodology to define structure as a local element set
Use data dictionary/documentation as basis for element labels and definitions
Assign URIs to each elementMake element set available to applications
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Case study: NLS DOD
Digital Object Database (National Library of Scotland)Metadata for digitized resources
Local schema expressed in a relational database structureNormalized (3rd form)Standard method for linked data representation
Standard design template used to derive element labels
Element set for descriptive metadata published using Open Metadata Registry (OMR)
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URI namespace domain = http://nlsdata.info/dod/elements/
Some idiosyncrasy
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Extracting data triples
Process the metadata records to output data valuesValues are the objects of data triples with
predicates taken from the local element setX nlsdod:hasTitle “Remarkable map”X nlsdod:hasDescription “Map of an unknown island”…
Subjects of triples are URIs for the individual thing being describedDerived from database “object” identifier
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Test sample: Haig Photographs collection
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Subject Predicate Object
d:D74547188 tDescription-title “Anti-aircraft gunner”
d:D74547188 tDescription-description “A soldier is sitting on the edge of a …”
d:D74547188 hasDateOrEvent k:D3014
d:D74547188 hasKeyword k:D3764
k:D3014 tKeyword-keyword “Ypres, 3rd Battle of, Ieper, Belgium, 1917”
k:D3764 tKeyword-keyword “Holes”
Data triples extracted from the DOD
Subject and object instance URIs derived from resource or record identifier
Internal links reflect database structure
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“Authority” strings assigned local things (URIs)
local:rowURI “stuff”local:hasKeywordLabel
global:URI
Local things can then be matched to global things
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External mappings
Mappings from local to global things stored as turtle filesSeparate from extracted local triples
New mappings can be added ad hocWhen resources availablePrioritised by local usage/focus/context
E.g. “Haig, Douglas, Sir, 1861-1928”E.g. “Ypres, 3rd Battle of, Ieper, Belgium, 1917”
dbPedia “Battle of Passchendaele”
Maps to external element sets support interoperability
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Demo Interface
All data is stored and processed as RDF triplesLocal data held in MySQL triple store (ARC2)External data is accessed live onlinePHP script uses ARC2 functionsEverything runs on a laptop, so here are some
screenshots …
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