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Linked Data tooling and XML WWW.FREME-PROJECT.EU 1
Co-funded by the Horizon 2020
Framework Programme of the European Union...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 2
BACKGROUND: THE FREME PROJECT
• Two year H2020 Innovation action; start...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 3
EXAMPLES:
See
http://www.w3.org/People/fsasaki/linked-data-tooling-xml-...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 4
WHAT IS LINKED DATA?
• A way to represent data on the Web
◦ Give each d...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 5
WHAT DO YOU DO WITH LINKED DATA?
• Creation
◦ From scratch
◦ Based on e...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 6
LINKED DATA TOOLING AND XML – BACKGROUND
• If you embrace the linked da...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 7
SYNTAXES
• Linked data can be written in various syntaxes
◦ RDF/XML: XM...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 8
TURTLE SYNTAX
@prefix db: <http://dbpedia.org/resource/>.
@prefix dbont...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 9
JSON-LD SYNTAX
{
"@context": { "db": "http://dbpedia.org/resource/", … ...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 10
RDF/XML SYNTAX
<rdf:RDF …>
<rdf:Description rdf:about="http://example....
Linked Data tooling and XML WWW.FREME-PROJECT.EU 11
FURTHER SYNTAXES
• See linked-data-tooling-xml-examples folder
◦ Micro...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 12
EXAMPLE: CONVERTING A TABLE TO LINKED DATA
Files:
• XML file with tabl...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 13
EXAMPLE: CONVERTING A TABLE TO LINKED DATA
Files:
• XML file with tabl...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 14
EXAMPLE: XML FORMAT SPECIFIC CONVERSION
Format “XLIFF”
Files:
• XLIFF ...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 15
SERVE YOUR OWN LINKED DATA
• Widely used server: Apache Jena Fuseki
◦ ...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 16
QUERYING LINKED DATA VIA XSLT
Files:
• XSLT stylesheet that processes ...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 17
SUMMARY – LINKED DATA AND XML TOOLING
• Easy to produce with existing ...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 18
FURTHER TOPICS
• Linked data support in XML data base solutions
◦ Exam...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 19
Co-funded by the Horizon 2020
Framework Programme of the European Unio...
Linked Data tooling and XML WWW.FREME-PROJECT.EU 20
CONTACTS
Felix Sasaki
E-mail: info@freme-project.eu
CONSORTIUM
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Linked data-tooling-xml

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Linked data-tooling-xml

  1. 1. Linked Data tooling and XML WWW.FREME-PROJECT.EU 1 Co-funded by the Horizon 2020 Framework Programme of the European Union Grant Agreement Number 644771 30 JUNE 2015 Felix Sasaki DFKI / W3C Fellow LINKED DATA TOOLING AND XML www.freme-project.eu
  2. 2. Linked Data tooling and XML WWW.FREME-PROJECT.EU 2 BACKGROUND: THE FREME PROJECT • Two year H2020 Innovation action; start February 2020 • Industry partners leading four business cases around digital content and (linked) data • Technology development bridging language and data • Outreach and business modelling demonstrating monetization of the multilingual data value chain
  3. 3. Linked Data tooling and XML WWW.FREME-PROJECT.EU 3 EXAMPLES: See http://www.w3.org/People/fsasaki/linked-data-tooling-xml-examples.zip
  4. 4. Linked Data tooling and XML WWW.FREME-PROJECT.EU 4 WHAT IS LINKED DATA? • A way to represent data on the Web ◦ Give each data item (a “resource”) an unique identifier: http://example.com/xml-ug-berlin ◦ Create links between data items; describe the type of links also via unique identifiers - http://example.com/xml-ug-berlin - http://schema.org/Place - http://dbpedia.org/resource/Berlin Means: “The XML User Group Berlin takes place in Berlin” In linked data terminology: a triple, consisting of subject, predicate and object • Linked data: applying Web principles to data ◦ Data item (a “resource”) = like a Web page with a web address ◦ Links between data items = links between pieces of web content ◦ Types of links are clear for the human reader The XML User Group Berlin takes place in <a href=”http://en.wikipedia.org/Berlin">Berlin</a> ◦ Linked data provides links in a machine readable way
  5. 5. Linked Data tooling and XML WWW.FREME-PROJECT.EU 5 WHAT DO YOU DO WITH LINKED DATA? • Creation ◦ From scratch ◦ Based on existing structured data ◦ Based on existing unstructured data • Storing ◦ RDF (“Resource Description Framework”) • Modelling of vocabularies (not covered here) ◦ Creating schemas for linked data ◦ Using schema languages with various levels of expressivity: RDF Schema , SKOS, OWL ◦ If possible: avoid and use existing linked data vocabularies • Consumption ◦ Query of linked data via SPARQL • Further processing
  6. 6. Linked Data tooling and XML WWW.FREME-PROJECT.EU 6 LINKED DATA TOOLING AND XML – BACKGROUND • If you embrace the linked data technology stack, use the Apache Jena Java library ◦ http://jena.apache.org/ ◦ Provides all you need for linked data creation, modelling, storage and query • This presentation assumes you want to integrate linked data processing with an XML technology stack – potential reasons ◦ You don’t want or cannot replace existing XML tooling ◦ Your data is both XML and linked data – you need to interface between the two ◦ Your workflow assumes both XML and linked data – at least partial conversion are needed • In general, don’t think about formal aspects of RDF – they are not needed for integration with XML processing
  7. 7. Linked Data tooling and XML WWW.FREME-PROJECT.EU 7 SYNTAXES • Linked data can be written in various syntaxes ◦ RDF/XML: XML syntax ◦ Turtle ◦ N3 ◦ JSON-LD ◦ RDFa • Examples are on the following slides
  8. 8. Linked Data tooling and XML WWW.FREME-PROJECT.EU 8 TURTLE SYNTAX @prefix db: <http://dbpedia.org/resource/>. @prefix dbont: <http://dbpedia.org/ontology/populationTotal>. @prefix sdo: <http://schema.org/>. <http://example.com/xml-ug-berlin> sdo:Place db:Berlin. db:Berlin dbont:populationTotal Structure: • Declaration of prefixes • Write each part of a triple (subject, predicate, object) explicitly • Easy to read & easy to create with XML tooling • Will be used here to create linked data • Example: see linked-data-tooling-xml-examples/example1.ttl
  9. 9. Linked Data tooling and XML WWW.FREME-PROJECT.EU 9 JSON-LD SYNTAX { "@context": { "db": "http://dbpedia.org/resource/", … }, "@graph": [ { "@id": "http://example.com/xml-ug-berlin", "schema:Place": { "@id": "dbpedia:Berlin" } }, { "@id": "dbpedia:Berlin", "dbont:populationTotal": 3415091 } ] } • Full example: see linked-data-tooling-xml-examples/example1.json
  10. 10. Linked Data tooling and XML WWW.FREME-PROJECT.EU 10 RDF/XML SYNTAX <rdf:RDF …> <rdf:Description rdf:about="http://example.com/xml-ug-berlin"> <sdo:Place> <rdf:Description rdf:about="http://dbpedia.org/resource/Berlin"> <dbont:populationTotal rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">3415091</dbont:popula tionTotal> </rdf:Description> </sdo:Place> </rdf:Description> </rdf:RDF> • Full example: see linked-data-tooling-xml-examples/example1.xml
  11. 11. Linked Data tooling and XML WWW.FREME-PROJECT.EU 11 FURTHER SYNTAXES • See linked-data-tooling-xml-examples folder ◦ Microdata: example1-microdata.html ◦ RDFa: example1-rdfa.html ◦ N-Triples: example1.nt • Tooling for conversion and validation ◦ Conversion: http://rdf-translator.appspot.com/ ◦ Conversion: http://www.easyrdf.org/converter ◦ JSON-LD checking: http://json-ld.org/playground/index.html ◦ RDF/XML validation: http://www.w3.org/RDF/Validator/
  12. 12. Linked Data tooling and XML WWW.FREME-PROJECT.EU 12 EXAMPLE: CONVERTING A TABLE TO LINKED DATA Files: • XML file with table: linked-data-tooling-xml-examples/table.xml • XSLT stylesheet to create turtle file: linked-data-tooling-xml-examples/table2ttl.xsl • Ouput in TTL: linked-data-tooling-xml-examples/table.ttl
  13. 13. Linked Data tooling and XML WWW.FREME-PROJECT.EU 13 EXAMPLE: CONVERTING A TABLE TO LINKED DATA Files: • XML file with table: linked-data-tooling-xml-examples/table.xml • XSLT stylesheet to create turtle file: linked-data-tooling-xml-examples/table2ttl.xsl • Ouput in TTL: linked-data-tooling-xml-examples/table.ttl Lessons learned: • Conversions are data and vocabulary specific • Good practices ◦ Use existing linked data vocabularies ◦ Link to existing linked data sources
  14. 14. Linked Data tooling and XML WWW.FREME-PROJECT.EU 14 EXAMPLE: XML FORMAT SPECIFIC CONVERSION Format “XLIFF” Files: • XLIFF Input file: linked-data-tooling-xml-examples/example-xliff.xlf • XSLT stylesheet to create turtle file: linked-data-tooling-xml-examples/xliff-to-nif.xsl • Output in TTL: linked-data-tooling-xml-examples/example-xliff.ttl
  15. 15. Linked Data tooling and XML WWW.FREME-PROJECT.EU 15 SERVE YOUR OWN LINKED DATA • Widely used server: Apache Jena Fuseki ◦ http://jena.apache.org/documentation/serving_data/ • Usage 1. Convert your XML data to RDF (see previous slides) 2. Install Apache Fuseki (with Java available: download > unzip > start server) 3. Add data via Fuseki Web interface http://localhost:3030 4. Run SPARQL queries
  16. 16. Linked Data tooling and XML WWW.FREME-PROJECT.EU 16 QUERYING LINKED DATA VIA XSLT Files: • XSLT stylesheet that processes linked data: linked-data-tooling-xml-examples/generate-markup-person.xsl • ePub file that has the unstructured content Workflow: • Stylesheet uses text content as input to linked data query • Query executed via SPARQL, uses Dbpedia SPARQL endpoint • Output is available in SPARQL query output format ◦ Has also XML syntax ◦ See example at linked-data-tooling-xml-examples/sparql-output.xml ◦ Can then be processed in XSLT
  17. 17. Linked Data tooling and XML WWW.FREME-PROJECT.EU 17 SUMMARY – LINKED DATA AND XML TOOLING • Easy to produce with existing XML content ◦ Use approaches for structured and unstructured content ◦ Store linked data in turtle syntax ◦ Provide via triple store • Easy to consume in XML tool chains ◦ Output of SPARQL queries: use XML based SPARQL result format ◦ Queries of public and your own data sets • Main missing piece: knowledge transfer - e.g. about ◦ Adequate syntaxes in your (XML) workflow ◦ Existing data sets: sustainability, quality, licenses, … ◦ How to interrelate linked data queries with XSLT (= via XML result format)
  18. 18. Linked Data tooling and XML WWW.FREME-PROJECT.EU 18 FURTHER TOPICS • Linked data support in XML data base solutions ◦ Example MarkLogic • Combined data and language processing ◦ Example FREME project (see following reference slides)
  19. 19. Linked Data tooling and XML WWW.FREME-PROJECT.EU 19 Co-funded by the Horizon 2020 Framework Programme of the European Union Grant Agreement Number 644771 30 JUNE 2015 Felix Sasaki DFKI / W3C Fellow LINKED DATA TOOLING AND XML www.freme-project.eu
  20. 20. Linked Data tooling and XML WWW.FREME-PROJECT.EU 20 CONTACTS Felix Sasaki E-mail: info@freme-project.eu CONSORTIUM

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