PanLex: RDF

Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. CC-BY-SA. lod-cloud.net

Overview

On this page we collect our efforts of making PanLex part of the Linked Open Data cloud, which offers the following advantages:

• Data can be looked up via URLs, e.g. http://ld.panlex.org/plx/approver/1
• Additional information is available via links to other knowledge bases. Currently this is DBpedia only, but others (e.g. Wortschatz) will follow soon.
• The SPARQL endpoint enables powerful queries over the data via the Web.
• RDF downloads enable one to load their own RDF store.

Downloads

Online Access

• The SPARQL endpoint is available at http://ld.panlex.org/sparql. Note that result sets are limited to 1000 rows.
• An additional HTML interface that provides clickable result sets is available at http://ld.panlex.org/snorql.

Example Resources:

• The first approver
• Definition 4711
• Public Domain License

Example Queries:

Prefix plx: <http://ld.panlex.org/plx/>
Select ?ta ?m ?tb ?lvl ?l {
    ?ea rdfs:label ?ta .

    ?da plx:denotationExpression ?ea .
    ?da plx:denotationMeaning ?m .
    ?db plx:denotationMeaning ?m .
    ?db plx:denotationExpression ?eb .

    ?eb rdfs:label ?tb .
    ?eb plx:languageVariety ?lv .
    ?lv rdfs:label ?lvl .
    ?lv plx:languageVarietyOf ?l .

    Filter(?ta = "translation"^^xsd:string)
}
Order By ?ta ?m ?tb ?lvl ?l

Prefix plx: <http://ld.panlex.org/plx/>
SELECT Distinct ?al ?alv ?alvl ?bl ?blvl ?blvo {
    ?ae rdfs:label ?al .
    ?ae plx:languageVariety ?alv .
    ?alv rdfs:label ?alvl .
    ?alv plx:languageVarietyOf ?alvo .
    ?alvo plx:iso639-3Code <http://ld.panlex.org/plx/iso639-3/eng> .

    ?ad plx:denotationExpression ?ae .
    ?ad plx:denotationMeaning ?m .
    ?bd plx:denotationMeaning ?m .
    ?bd plx:denotationExpression ?be .

    ?be rdfs:label ?bl .
    ?be plx:languageVariety ?blv .
    ?blv rdfs:label ?blvl .
    ?blv plx:languageVarietyOf ?blvo .

    Filter(?al = "dictionary"^^xsd:string)
}
Order By ?al ?blvl ?bl ?blvo

The PanLex Ontology

These two images provide an overview of how classes and properties in the RDF version of PanLex relate.

Dataset Metrics

The following table summarizes the number of triples, classes and properties.

This table lists the number of instances per class:

Licenses

As PanLex is comprised of thousands of data sources, license information is included in the dataset for each approver. The following table shows some examples on this subject.

Prefix plx: <http://ld.panlex.org/plx/>
Select ?l (Count(*) As ?c) {
  ?s plx:license ?l
}
Group By ?l

Prefix plx: <http://ld.panlex.org/plx/>
Select * {
  ?s
    a plx:Approver ;
    plx:license ?l
}
Limit 100

Prefix plx: <http://ld.panlex.org/plx/>
Select * {
  ?s
    a plx:Approver ;
    plx:license <http://ld.panlex.org/plx/license/nr>
}
Limit 100

How the RDF data is generated

The PanLex RDF dataset is created using the Sparqlify RDB-RDF mapping tool. The corresponding RDF view definitions are available here. The Linked Data interface is powered directly by the PanLex's Postgres database. For improved query performance, the source data is also dumped as RDF and loaded into an OpenLink's Virtuoso RDF store.