Question

如何使用rdflib.js在乌龟中序列化RDF？文档不多。我可以用：

import Foundation

var strings = ["AB111ZX","CD123EF","AB222ZX","A123ZX","AB123X","AB123","123ZX"]

strings = strings.flatMap {
  guard $0.hasPrefix("AB") && $0.hasSuffix("ZX") else { return nil }
  return $0.stringByTrimmingCharactersInSet(NSCharacterSet(charactersInString: "ABZX"))
}

print(strings)

// ["111","222"]

序列化为N3格式，但除此之外并不多。我已经尝试将上述命令改为StatementToTtl / Turtle / TURTLE / TTL，但似乎没有任何效果。

Answer 1

想出来。由this (secret) Github gist提供。

$rdf.serialize(undefined, source, undefined,` 'text/turtle', function(err, str){
// do whatever you want, the data is in the str variable.
})

这是前面提到的Github要点的代码。

/**
* rdflib.js with node.js -- basic RDF API example.
* @author ckristo
*/

var fs = require('fs');
var $rdf = require('rdflib');

FOAF = $rdf.Namespace('http://xmlns.com/foaf/0.1/');
XSD  = $rdf.Namespace('http://www.w3.org/2001/XMLSchema#');

// - create an empty store
var kb = new $rdf.IndexedFormula();

// - load RDF file
fs.readFile('foaf.rdf', function (err, data) {
if (err) { /* error handling */ }

// NOTE: to get rdflib.js' RDF/XML parser to work with node.js,
// see https://github.com/linkeddata/rdflib.js/issues/47

// - parse RDF/XML file
$rdf.parse(data.toString(), kb, 'foaf.rdf', 'application/rdf+xml', function(err, kb) {
    if (err) { /* error handling */ }

    var me = kb.sym('http://kindl.io/christoph/foaf.rdf#me');

    // - add new properties
    kb.add(me, FOAF('mbox'), kb.sym('mailto:e0828633@student.tuwien.ac.at'));
    kb.add(me, FOAF('nick'), 'ckristo');

    // - alter existing statement
    kb.removeMany(me, FOAF('age'));
    kb.add(me, FOAF('age'), kb.literal(25, null, XSD('integer')));

    // - find some existing statements and iterate over them
    var statements = kb.statementsMatching(me, FOAF('mbox'));
    statements.forEach(function(statement) {
        console.log(statement.object.uri);
    });

    // - delete some statements
    kb.removeMany(me, FOAF('mbox'));

    // - print modified RDF document
    $rdf.serialize(undefined, kb, undefined, 'application/rdf+xml', function(err, str) {
        console.log(str);
    });
});
});

Rdflib.js，如何将数据序列化为turtle（.ttl）格式？

1 个答案: