Status Quo and (current) limitations of Library Linked Data - PowerPoint PPT Presentation

Status Quo and (current) limitations of Library Linked Data Asunción Gómez-Pérez 1 , Philipp Cimiano 2 and Daniel Vila-Suero 1 1 Facultad de Informática, Universidad Politécnica de Madrid Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid http://www.oeg-upm.net asun,dvila@fi.upm.es 2 AG Semantic Computing, CITEC, University of Bielefeld cimianog@cit-ec.uni-bielefeld.de Acknowledgments: BNE team, DNB team, Uldis Bojars (NLL), Jodi Schneider (NUIG) and others SWIB12 – Cologne, 28-11-2012

Outline • The Library Linked Data Cloud • A (library) Linked Data Life-cycle • A collection of current limitations • Conclusions 2

Library Linked Data cloud 3

Library Linked Data Cloud 4

Library Linked Data Cloud British Library Data Model - Book Key Publication Events Series foaf:Agent @prefix blt: <http://www.bl.uk/schemas/bibliographic/blterms#> . event:Event dcterms:Agent @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . bibo:Series blt:PublicationEvent External An Instance @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . Link skos:prefLabel @prefix owl: <http://www.w3.org/2002/07/owl#> . skos:notation geo:SpatialThing rdfs:subClassOf @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . a MARC country code @prefix dct: <http://purl.org/dc/terms/> . a bibo:issn A Class URI A Literal @prefix isbd: <http://iflastandards.info/ns/isbd/elements/> . All properties with a range of @prefix skos: <http://www.w3.org/2004/02/skos/core#> . a Series Agent blt:PublicationEvent can be used foaf:focus @prefix bibo: <http://purl.org/ontology/bibo/> . BL URI BL URI with blt:PublicationStartEvent @prefix rda: <http://rdvocab.info/ElementsGr2/> . Place and blt:PublicationEndEvent. @prefix bio: <http://purl.org/vocab/bio/0.1/> . Author BL URI rdfs:subClassOf Arrows omitted for clarity. @prefix foaf: <http://xmlns.com/foaf/0.1/> . GeoNames URI @prefix event: <http://purl.org/NET/c4dm/event.owl#> . bio:Birth @prefix org: <http://www.w3.org/ns/org#> . blt:PublicationStartEvent event:agent @prefix geo: <http://www.w3.org/2003/01/geo/wgs84_pos#> . event:place CalendarYear a a dct:isPartOf event:place a bio:Death a LCSH URI if http://r.d.g/id/year/ rdfs:subClassOf PublicationStartEvent available xxxx bio:date BL URI a bio:date owl:sameAs blt:PublicationEndEvent id.loc.gov URI for Birth BL URI dct:hasPart event:time scheme skos:inScheme PublicationEvent Death BL URI blt:publicationStart Topic LCSH BL URI a foaf:familyName BL URI a blt:publication PublicationEndEvent blt:TopicLCSH BL URI foaf:givenName bio:event dct:BibliographicResource bio:event foaf:name blt:publicationEnd bibo:Book Person-as-Agent or Person-as-Concept rdfs:subClassOf BL URI a dct:subject bibo:MultiVolumeBook foaf:Agent BL URI a a dct:Agent blt:PersonConcept dct:creator foaf:Person foaf:focus skos:inScheme blt:hasCreated owl:sameAs a rdfs:subClassOf id.loc.gov URI for rda:periodOfActivityOfThePerson scheme dct:contributor dct:subject blt:hasContributedTo Skos:Concept VIAF URI if available Family-as-Concept BL URI dct:subject Resource dct:creator rdfs:subClassOf a BL URI blt:hasCreated Organization-as-Agent BL skos:inScheme foaf:focus dct:subject URI blt:FamilyConcept dct:contributor rdfs:label blt:hasContributedTo a Family-as-Agent rdfs:label id.loc.gov URI for BL URI [foaf:name] scheme foaf:Agent dct:Agent rdfs:subClassOf foaf:Organization dct:language org:Organization foaf:focus blt:bnb bibo:isbn13 Lexvo URI bibo:isbn10 Organization-as-Concept blt: Organization Concept a BL URI dct:subject dct:subject dct:abstract Identifiers skos:inScheme foaf:focus dct:tableOfContents dct:title rdfs:subClassOf dct:alternative MARC language isbd:P1008 id.loc.gov URI for code URI (edition statement) scheme dct:spatial blt:TopicDDC isbd:P1073 a Dewey skos:prefLabel (note on language) skos:notation BL URI Title isbd:P1042 skos:inScheme dct:description (content note) skos:broader Dewey Info URI for isbd:P1053 skos:notation scheme New version of datos.bne.es by (extent) bibo:numVolumes Place-as-Concept Dewey Info URI Place-as-Thing BL URI foaf:focus BL URI Miscellaneous literals a owl:sameAs a beginning of 2013 including: rdfs:subClassOf Subject Tim Hodson - tim.hodson@talis.com Assume that most instance data will have blt:PlaceConcept LCSH URI if geo:SpatialThing Corine Deliot - Corine.Deliot@bl.uk an rdfs:label. These properties have been available dct:Location Alan Danskin - Alan.Danskin@bl.uk omitted for clarity. Heather Rosie - Heather.Rosie@bl.uk V.1.4 August 2012 Jan Ashton - Jan.Ashton@bl.uk - Links to digital objects - More links to external datasets - APIs and improved documentation 5

Library Linked Data Cloud And many others (see http://thedatahub.org/group/lld ) 6

Library Linked Data Cloud • Availability of Library Linked Data is already a reality • Many serious efforts : id.loc.gov, VIAF, DNB, data.bnf.fr, Bibliographic Framework Initiative etc. • Still several challenges and limitations preventing LLD full potential 7

A (library) Linked Data life-cycle 8

A (Library) Linked Data Life-cycle SPECIFICATION • A series of steps or phases MODELLING • Based on Villazón-Terrazas et al.* RDF GENERATION • Others : LOD2, Datalift, etc. (see http://www.w3.org/2011/gld/wiki/ GLD_Life_cycle) LINKING ENRICHMENT PUBLICATION * Methodological Guidelines for Publishing Government Linked Data , Boris Villazón-Terrazas, Luis. M. Vilches-Blázquez, EXPLOITATION Oscar Corcho and Asunción Gómez-Pérez Linking Goverment Data Book 9

A (Library) Linked Data Life-cycle SPECIFICATION Definition and analysis of MODELLING source data and their format, structure, etc. RDF GENERATION LINKING ENRICHMENT PUBLICATION EXPLOITATION 10

A (Library) Linked Data Life-cycle SPECIFICATION - Selection and reuse of vocabularies to represent MODELLING LD. - Creation of new local RDF terms and mapping to GENERATION existing vocabularies LINKING ENRICHMENT PUBLICATION EXPLOITATION 11

A (Library) Linked Data Life-cycle SPECIFICATION Taking source data, and vocabularies: MODELLING Mapping (cross-walk) source data to produce RDF RDF GENERATION LINKING ENRICHMENT PUBLICATION EXPLOITATION 12

A (Library) Linked Data Life-cycle SPECIFICATION - Discover related resources (ideally in RDF MODELLING form). - Enrich RDF data with data from other sources (e.g. RDF substitute literals by URIs in GENERATION other datasets) LINKING ENRICHMENT PUBLICATION EXPLOITATION 13

A (Library) Linked Data Life-cycle SPECIFICATION - Setup the infrastructure to expose your data to the Web MODELLING (SPARQL, APIs, dumps). - Enable discovery of your RDF data (sitemap, voID) GENERATION - Include data provenance, license, etc. LINKING ENRICHMENT PUBLICATION EXPLOITATION 14

A (Library) Linked Data Life-cycle SPECIFICATION - Produce user interfaces that integrate your data (and MODELLING other sources) - Provide innovative RDF services on top of the data GENERATION - Integrate with existing services (e.g. patron LINKING services), etc. ENRICHMENT PUBLICATION EXPLOITATION 15

A collection of current limitations 16

Specification • MANY source formats, encodings and schemas: SPECIFICATION MODELLING <XML> RDF GENERATION CSV PICA+ LINKING ENRICHMENT MAB PUBLICATION EXPLOITATION 17

Specification LIMITATIONS: SPECIFICATION 1. Lack of principled methods , techniques and tools to MODELLING deal with heterogeneous source formats , schemas and encodings RDF metastream, metamorph APIs from culturegraph GENERATION 2. Need for analysis of the semantics of metadata schemas and the variation of their usage accross LINKING ENRICHMENT libraries: MARC 21 : " Marc21 as Data: A start ". Karen Coyle's code4lib's article * PUBLICATION EXPLOITATION * http://journal.code4lib.org/articles/5468 18