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Open Data Mashups: linking fragments into mosaics
Philippe Duchesne, HighLatitudes
[email protected]@pduchesne
Open Tools & Standards workshopOpenBelgium 2015
Namur, February 23rd, 2015
Linked Data
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Data is live and interoperable.Almost there…
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Background
Observation: when collating hypermedia resources, data curators face issues such as► not owning referred data
sources► need resources identified by
URIs ► need to organize
annotate storeexchange
the result of their curation as a resource of its own Remote resources
Linked Data
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Linked Data
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Linked Data
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Linked Data
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is
has
contains
near
about
Linked Data
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is
has
contains
near
about
Linked Data
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Different use cases, different link sets
►Urban planning
►Traffic Monitoring
►Tourism
►…… a catalog of contexts of use
Representation– RDF, JSON-LD
Link vocabularies : Ontologies– DublinCore, FOAF, DCAT, Schema.org,…– Numerous domain-specific ontologies– see http://lov.okfn.org
Linked Data Standards
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<rdf:RDF xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcat="http://www.w3.org/ns/dcat#" xmlns:dct="http://purl.org/dc/terms/"> <dcat:Dataset rdf:about="http://portal.openbelgium.be/dataset/wms-des-sites-natura-2000-en-vigueur"> <owl:sameAs rdf:resource="urn:uuid:2a1d4058-50cd-42f2-947b-71ea9d0173ce"></owl:sameAs> <dct:description>Le jeu de données géographiques NATURA2000 vise à localiser les sites Natura 2000 wallons et à l'intérieur de ceux-ci les unités de gestion. A chaque unité de gestion correspond un ensemble de mesures de gestion</dct:description> <foaf:homepage rdf:resource="http://portal.openbelgium.be/dataset/wms-des-sites-natura-2000-en-vigueur"></foaf:homepage> <rdfs:label>wms-des-sites-natura-2000-en-vigueur</rdfs:label> <dct:identifier>wms-des-sites-natura-2000-en-vigueur</dct:identifier> <dct:title>WMS des sites Natura 2000 en vigueur</dct:title> <dcat:distribution> <dcat:Distribution> <dcat:accessURL rdf:resource="http://geoservices.wallonie.be/services/FAUNE_FLORE/NATURA_2000/WMSServer"/> <dct:format>WMS</dct:format> <dct:title>Natura 2000</dct:title> </dcat:Distribution> </dcat:distribution> <dct:relation> <rdf:Description> <rdfs:label>responsible-party</rdfs:label> <rdf:value>[{"name": "SPW-DGO3-DEMNA-DCD", "roles": ["pointOfContact"]}]</rdf:value> </rdf:Description> </dct:relation> […] </dcat:Dataset></rdf:RDF>
Linked Data Examples
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http://portal.openbelgium.be/dataset/wms-des-sites-natura-2000-en-vigueur.rdf
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http://lod-cloud.net
Linked Data Examples
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Background
Observation: when collating hypermedia resources, data curators face issues such as► not owning referred data
sources► need only parts of resources
identified by URIs ► need to organize
annotate storeexchange
the result of their curation as a resource of its own Remote resources
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http://server.com/myResource
URI fragments
#fragment
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► URI spec leaves the fragment part unspecified
► Several standardization efforts exist regarding specific mime types– MediaFragments (W3C Recommandation)
• Focused on temporal (#t) and pixel space fragments (#xywh)
• Dedicated to audio/video media
– text/csv fragments (IETF Draft)• Defines #col,row,cell
– text/plain fragments (IETF RFC 5147)• Defines #line
Formalizing fragments
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Other mainstream usages
► #t for YouTube videos► #page for PDF resources► #<id> implicit id fragment used in
HTML, RDF, …
But no harmonized definition of fragments for all media types
Formalizing fragments
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Identified dimensions that are subject to fragments► Textual #line► Temporal #t► Pixel space #xywh► Tabular#col,row
► Geospatial space #bbox► Tree path #xpath
Formalizing fragments
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Id Text Time Pixel Spatial Tabular Tree
html ✔ ✔
text/plain ✔
pdf ✔ ✔
video/* ✔ ✔
audio/* ✔
image/* ✔
geotiff ✔ ✔
kml ✔ ✔ ✔ ✔
csv ✔
json ✔
Formalizing fragments
► Objective : build mosaics documents from fragments
► Define mosaic model on top of existing vocabularies► Open Annotations
http://www.openannotation.org ► Seamless integration in regular
browser flow
Mosaics
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Demo
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http://demo.mosaics.highlatitud.es/#/samples/demo
► Work Context storage and sharing– Disaster management
► Embedding original data– Open Science
► Fact checking– Political transparency– Data Journalism
It’s all about stitching together heterogeneous data fragments into meaningful and contextualized patchworks
Use cases
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• Seamless integration of authoring/viewing avoids breaking train of thought favors engagement and better captures domain knowledge
• Data mosaics act as exchangeable “mind map” containers, capturing contextual metadata in a domain-specific perspective, for specific use cases
Conclusions
