User talk:Chjohnson39

talk

Previous discussion was archived at User talk:Chjohnson39/Archive 1 on 2016-03-20.

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Trizek (WMF), on behalf of the Collaboration team, 11:56, 7 September 2016 (UTC)

similar in output function to the Wikidata Generic Tree tool developed by Magnus_Manske, I have written a SPARQL query that expands entities along a property path or inverse property path.

It only works on the Virtuoso test instance at http://wdm-rdf.wmflabs.org/sparql.

The query looks pretty ugly, but the output is very interesting. This query finds all "parents" (parent taxons, subclasses or parts) of the species "leopard". But, unlike a simple property path result set aggregation, it also shows you how the path is constructed.

It can traverse multiple entities and accepts multiple paths. Since the subject variable is actually bound to the object the default direction is to go up the tree, rather than down, which is actually quite useful and not a feature in the UI. To go down the tree, use the ^ symbol which inverts the path traversal. To restrict the depth of the query, just add transitive option t_max (n).

select distinct ?o ?label ?uri ?rlabel where { { select ?s where { VALUES(?s) {(wd:Q34706)} } } { select ?s ?o ?rlabel ?label ?uri where { ?s wdt:P171|wdt:P279|wdt:P361 ?o . ?o rdfs:label ?label FILTER (lang(?label) = "en"). OPTIONAL {?o wdt:P105 ?rank . ?rank rdfs:label ?rlabel FILTER (lang(?rlabel) = "en") } . OPTIONAL {?o foaf:isPrimaryTopicOf ?uri FILTER regex (?uri, "^http://en.wikipedia.org/wiki/<nowiki>") }} } option (TRANSITIVE, T_IN (?s), T_OUT (?o), T_DISTINCT) }</nowiki>

click here to see the output