Linked Open Data with Semantic MediaWiki
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This document discusses how to use Semantic MediaWiki (SMW) to publish open linked data. SMW can annotate data with metadata and export it using semantic web standards. The document provides examples of how to link SMW data to external identifiers like Wikidata, use external vocabularies via import declarations, and reconcile SMW data with Wikidata to enable data sharing across platforms. Future developments may improve integration with Wikidata through properties mapping and data pushing capabilities.
![www.kdz.eu
Linking to external identifiers
Define a property
Assign datatype
„External identifier“
Links to external ids
Look for other identifiers
ORCID https://orcid.org/
GND
…..
[[Has type::External identifier]]
[[External formatter uri::http://www.wikidata.org/entity/$1]]](https://image.slidesharecdn.com/linkediopendatawithsemanticmediawiki-krabina2020-201126093852/85/Linked-Open-Data-with-Semantic-MediaWiki-9-320.jpg)
![www.kdz.eu
Excursion: Service Links
Only works in Special:Browse
https://github.com/SemanticMediaWiki/SemanticMediaWiki/issues/4020
Property:WikidataID [[provides service::wikidata]]
MediaWiki:Smw_service_wikidata:
Wikidata|http://www.wikidata.org/entity/$1](https://image.slidesharecdn.com/linkediopendatawithsemanticmediawiki-krabina2020-201126093852/85/Linked-Open-Data-with-Semantic-MediaWiki-10-320.jpg)
![www.kdz.eu
Using External Vocabularies
Add a page MediaWiki:Smw import foaf
Instead of local datatype declarations, use
[[Imported from::foaf:familyName]]
on the property page (e. g. Property:Last name)
To change a datatype, change it on MediaWiki:Smw
import foaf
https://www.semantic-mediawiki.org/wiki/Help:
Import_vocabulary
https://github.com/TIBHannover/ontology2smw/tree/issue31_ontologies_wout_aeon
Ad more vocabulary
terms any time…](https://image.slidesharecdn.com/linkediopendatawithsemanticmediawiki-krabina2020-201126093852/85/Linked-Open-Data-with-Semantic-MediaWiki-11-320.jpg)
![www.kdz.eu
The Future (of Knowledge Sharing)
reuse of „Service links“?
SMW could use the „Reconciliation API“ of
Wikidata
https://github.com/OpenRefine/OpenRefine/wiki/Reconciliation-Service-API
Flexibility of SMW property declaration could be
used to map to Wikidata properties
assign SMW Property:Country to P17
[[Imported from::ow:equivalentClass::P17]]
this changes RDF output, does not (yet) trigger feature inside SMW
pushing data to Wikidata (or other repos): should be doable inside
SMW: on a per-entry-base or batch](https://image.slidesharecdn.com/linkediopendatawithsemanticmediawiki-krabina2020-201126093852/85/Linked-Open-Data-with-Semantic-MediaWiki-18-320.jpg)
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Linked Open Data with Semantic MediaWiki
- 1. CC-BY · page 1 Linked (Open) Data with SMW #SMWCon, November 26, 2020 Bernhard Krabina
- 2. www.kdz.eu Semantic MediaWiki Collaborative data curation tool Metadata tool (Content + Metadata) Annotate data in texts Knowledge Graph Interface Web-based database Open-Source, with vibrant community Uses Semantic Web Standards Internal querying of data Importing and exporting of data Business logic can be implemented by customization, without PHP programming
- 3. www.kdz.eu The Web is evolving…
- 5. www.kdz.eu 5 Star-Schema of Linked (Open) Data
- 6. www.kdz.eu Linked Data vs. Open data 26 November 2020 · Seite 6
- 7. www.kdz.eu Open Data and SMW Make your SMW readable by everyone editing can still be restricted to logged-in users Include an open license see https://www.mediawiki.org/wiki/Manual:Copyright Make it easy for users to access your data: SMW puts a link to the RDF-representation (Special:ExportRDF) in the HTML automatically, see https://www.semantic- mediawiki.org/wiki/Help:RDF_export create an RDF Dump https://www.semantic- mediawiki.org/wiki/Help:Maintenance_script_dumpRDF.php indicate exporting of data on pages or lists (e. g. vCard, iCalendar, BibTex, KML) provide export pages with explanations and several result formats (CSV, JSON, RDF)
- 8. www.kdz.eu Example: FINA Wiki https://fina.oeaw.ac.at/wiki
- 9. www.kdz.eu Linking to external identifiers Define a property Assign datatype „External identifier“ Links to external ids Look for other identifiers ORCID https://orcid.org/ GND ….. [[Has type::External identifier]] [[External formatter uri::http://www.wikidata.org/entity/$1]]
- 10. www.kdz.eu Excursion: Service Links Only works in Special:Browse https://github.com/SemanticMediaWiki/SemanticMediaWiki/issues/4020 Property:WikidataID [[provides service::wikidata]] MediaWiki:Smw_service_wikidata: Wikidata|http://www.wikidata.org/entity/$1
- 11. www.kdz.eu Using External Vocabularies Add a page MediaWiki:Smw import foaf Instead of local datatype declarations, use [[Imported from::foaf:familyName]] on the property page (e. g. Property:Last name) To change a datatype, change it on MediaWiki:Smw import foaf https://www.semantic-mediawiki.org/wiki/Help: Import_vocabulary https://github.com/TIBHannover/ontology2smw/tree/issue31_ontologies_wout_aeon Ad more vocabulary terms any time…
- 12. www.kdz.eu Using Page ID a unique ID Define a property Assign datatype „Text“ Set property in template https://fina.oeaw.ac.at/wiki/?curid=10415 For „Magic Word“ {{PAGEID}} see https://www.mediawiki.org/wiki/Help: Magic_words#Technical_metadata https://www.mediawiki.org/wiki/Manual: Page_table#page_id {{#set:FINA ID={{PAGEID}}}}
- 13. www.kdz.eu Excursion: PageIDs Set another property PageID datatype „Page“ Use „Query forms“ for an ID lookup See Page Forms extension https://www.mediawiki.org/wiki/Extension: Page_Forms/Creating_query_forms
- 15. www.kdz.eu Wikidata Mix‘n‘Match https://meta.wikimedia.org/wiki/Mix%27n%27match/Manual With „Templatefile“ format, it should be possible to provide a Mix‘n‘match file: https://www.semantic-mediawiki.org/wiki/Help:Templatefile_format To be used by the M‘n‘M importer https://mix-n-match.toolforge.org/import.php
- 16. www.kdz.eu BEACON https://www.semantic- mediawiki.org/wiki/Help:BEACON
- 17. www.kdz.eu Reconciliation / OpenRefine SMW can provide „result formats“ RDF, JSON, CSV, etc. these an be accessed directly in OpenRefine “Reconciliation” means to look for data matches with WikiData SMW can re-import data via DataTransfer extension
- 18. www.kdz.eu The Future (of Knowledge Sharing) reuse of „Service links“? SMW could use the „Reconciliation API“ of Wikidata https://github.com/OpenRefine/OpenRefine/wiki/Reconciliation-Service-API Flexibility of SMW property declaration could be used to map to Wikidata properties assign SMW Property:Country to P17 [[Imported from::ow:equivalentClass::P17]] this changes RDF output, does not (yet) trigger feature inside SMW pushing data to Wikidata (or other repos): should be doable inside SMW: on a per-entry-base or batch
- 19. www.kdz.eu Contact 19 Bernhard Krabina [email protected] www.kdz.or.at @krabina