java - Retrieving DBpedia ontology classes by label in a particular language? -

java - Retrieving DBpedia ontology classes by label in a particular language? -

i have dbpedia ontology downloaded http://wiki.dbpedia.org/downloads39. in ontology, have, example, situation:

class="lang-xml prettyprint-override"><owl:class rdf:about="http://dbpedia.org/ontology/basketballleague"> <rdfs:label xml:lang="el">Ομοσπονδία Καλαθοσφαίρισης</rdfs:label><rdfs:label xml:lang="fr">ligue de basketball</rdfs:label><rdfs:label xml:lang="en">basketball league</rdfs:label><rdfs:label xml:lang="it">lega di pallacanestro</rdfs:label><rdfs:label xml:lang="ja">バスケットボールリーグ</rdfs:label><rdfs:comment xml:lang="en">a grouping of sports teams compete against each other in basketball</rdfs:comment><rdfs:subclassof rdf:resource="http://dbpedia.org/ontology/sportsleague"/> </owl:class>

now, want read ontology using jena , retrieve owl class has object ""ligue de basketball" in french language. don't know how can utilize jena library set french language in case.

from dbpedia ontology, seems xml:lang="fr" predicate, have tried code:

string inputfilename = "c:\\dbpedia_3.9.owl"; // create empty in-memory ontology model ontdocumentmanager mgr = new ontdocumentmanager(); ontmodelspec s = new ontmodelspec( ontmodelspec.rdfs_mem ); s.setdocumentmanager( mgr ); ontmodel m = modelfactory.createontologymodel( s, null ); // utilize filemanager open ontology filesystem inputstream in = filemanager.get().open(inputfilename); if (in == null) { throw new illegalargumentexception( "file: " + inputfilename + " not found"); } // read ontology file m.read( in, "" ); stmtiterator stmti = m.liststatements(); while (stmti.hasnext()){ statement statement = stmti.nextstatement(); system.out.println (statement.getpredicate()); }

but only:

http://www.w3.org/2000/01/rdf-schema#label

i don't info on language in predicate. why? how can retrieve info , owl class? doing wrong here?

you need read on literals in rdf , how they're encoded in rdf/xml. ontology snippet you've shown in rdf/xml (which not designed human readable), , xml:lang not property. xml:lang attribute used specify language of literal has language tag.

2.7 languages: xml:lang

rdf/xml permits utilize of xml:lang attribute defined 2.12 language identification of xml 1.0 [xml] allow identification of content language. xml:lang attribute can used on node element or property element indicate included content in given language. typed literals includes xml literals not affected attribute. specific in-scope language nowadays (if any) applied property element string literal content or property attribute values. xml:lang="" form indicates absence of language identifier.

some examples of marking content languages rdf properties shown in illustration 8:

example 8: finish illustration of xml:lang (example08.rdf output example08.nt) class="lang-xml prettyprint-override"><?xml version="1.0" encoding="utf-8"?> <rdf:rdf xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/"> <rdf:description rdf:about="http://www.w3.org/tr/rdf-syntax-grammar"> <dc:title>rdf/xml syntax specification (revised)</dc:title> <dc:title xml:lang="en">rdf/xml syntax specification (revised)</dc:title> <dc:title xml:lang="en-us">rdf/xml syntax specification (revised)</dc:title> </rdf:description> <rdf:description rdf:about="http://example.org/buecher/baum" xml:lang="de"> <dc:title>der baum</dc:title> <dc:description>das buch ist außergewöhnlich</dc:description> <dc:title xml:lang="en">the tree</dc:title> </rdf:description> </rdf:rdf>

if @ example08.nt linked above, you'll see triples include:

class="lang-none prettyprint-override"><http://www.w3.org/tr/rdf-syntax-grammar> <http://purl.org/dc/elements/1.1/title> "rdf/xml syntax specification (revised)" . <http://www.w3.org/tr/rdf-syntax-grammar> <http://purl.org/dc/elements/1.1/title> "rdf/xml syntax specification (revised)"@en . <http://www.w3.org/tr/rdf-syntax-grammar> <http://purl.org/dc/elements/1.1/title> "rdf/xml syntax specification (revised)"@en-us . <http://example.org/buecher/baum> <http://purl.org/dc/elements/1.1/title> "der baum"@de . <http://example.org/buecher/baum> <http://purl.org/dc/elements/1.1/title> "the tree"@en .

the resources have multiple values property dc:title. xml:lang not property, used specify part of literal.

the same thing true in dbpedia data. there multiple values of property rdfs:label, , xml:lang attributes in rdf/xml serialization used indicate language. dbpedia unavailable me @ moment, if go http://dbpedia.org/ontology/basketballleague , scroll bottom of page, you'll able download info in various formats. if download in ttl/n3 format, you'll see content this:

class="lang-none prettyprint-override">dbpedia-owl:basketballleague rdfs:label "basketball league"@en , "Ομοσπονδία Καλαθοσφαίρισης""@el , "ligue de basketball"@fr, ...

you need object of predicate getobject, whether whether it's literal isliteral, , when utilize getlanguage language tag if has one. javadocs relevant classes describe methods you'll need. i've linked literal class before in paragraph.

java jena owl ontology dbpedia