DBpediaの検索 ― 2008-11-26 08:56:02
DBpedia(http://wiki.dbpedia.org/)の検索を試してみる．
DBPediaはWikipediaから構造化されたデータを取り出し，利用可能な情報を作成しているコミュニティ．
非常に大きなデータセットを公開している．
殆どが英語のデータであるが，一部日本語のデータもある．
SPARQLの練習にもちょうどいい．
SPARQLエンドポイントもいくつか公開されている．
例えば，ここ http://dbpedia.org/sparql
とりあえず人口(http://dbpedia.org/property/population)が100万人を超えた都市（http://dbpedia.org/ontology/City）を検索する．そして，georssの位置情報(http://www.georss.org/georss/point)があればそれも表示する．表示言語は日本語．
難しいね．．．
Webがデータベースのように利用できる日は来るのか．．．利用できるようになったとして，どうするのか．
DBPediaはWikipediaから構造化されたデータを取り出し，利用可能な情報を作成しているコミュニティ．
非常に大きなデータセットを公開している．
殆どが英語のデータであるが，一部日本語のデータもある．
SPARQLの練習にもちょうどいい．
SPARQLエンドポイントもいくつか公開されている．
例えば，ここ http://dbpedia.org/sparql
とりあえず人口(http://dbpedia.org/property/population)が100万人を超えた都市（http://dbpedia.org/ontology/City）を検索する．そして，georssの位置情報(http://www.georss.org/georss/point)があればそれも表示する．表示言語は日本語．
SELECT * WHERE {
?s rdf:type <http://dbpedia.org/ontology/City> .
?s <http://dbpedia.org/property/population> ?population .
?s <http://www.w3.org/2000/01/rdf-schema#label> ?label .
optional { ?s <http://www.georss.org/georss/point> ?point . }
filter (?population >= 1000000) .
filter (lang(?label)="ja") .
}
さて，これをどうしようか．．．難しいね．．．
Webがデータベースのように利用できる日は来るのか．．．利用できるようになったとして，どうするのか．
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