甜RDF/quick-rdf

又一 个RDF库

2.0.1 2024-03-13 14:37 UTC

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一个为PHP提供的RDF库,实现了https://github.com/sweetrdf/rdfInterface术语和数据集。

设计为快速和内存高效。

这是通过使用全局术语哈希表并在给定时间只存储相同rdfInterface术语的一个副本来实现的。它允许在密集图中节省大量内存,并提供闪电般的术语比较(如果且仅如果它是同一对象)。它还提供了一个非常高效的Dataset集合操作实现,使用PHP的SplObjectStorage。

数据集实现维护索引,允许快速四元组搜索(如果需要,可以关闭索引,因为它会显著减慢数据集的创建)。

安装

  • 获取Composer
  • 运行composer require sweetrdf/quick-rdf
  • 运行composer require sweetrdf/quick-rdf-io来安装解析器和序列化器。

自动生成的文档

https://sweetrdf.github.io/quickRdf/namespaces/quickrdf.html

它很不完整,但总比没有好。
包含RdfInterface文档,它解释了最重要的设计决策。

用法

(您还可以查看通用的rdfInterface 示例

include 'vendor/autoload.php';

use quickRdf\DataFactory as DF;

$graph = new quickRdf\Dataset();
$parser = new quickRdfIo\TriGParser();
$stream = fopen('pathToTurtleFile', 'r');
$graph->add($parser->parseStream($stream));
fclose($stream);

// count edges in the graph
echo count($graph);

// go trough all edges in the graph
foreach ($graph as $i) {
  echo "$i\n";
}

// find all graph edges with a given subject
echo $graph->copy(DF::quadTemplate(DF::namedNode('http://mySubject')));

// find all graph edges with a given predicate
echo $graph->copy(DF::quadTemplate(null, DF::namedNode('http://myPredicate')));

// find all graph edges with a given object
echo $graph->copy(DF::quadTemplate(null, null, DF::literal('value', 'en')));

// replace an edge in the graph
$edge = DF::quad(DF::namedNode('http://edgeSubject'), DF::namedNode('http://edgePredicate'), DF::namedNode('http://edgeObject'));
$graph[$edge] = $edge->withObject(DF::namedNode('http://anotherObject'));

// find intersection with other graph
$graph->copy($otherGraph); // immutable
$graph->delete($otherGraph); // in-place

// compute union with other graph
$graph->union($otherGraph); // immutable
$graph->add($otherGraph); // in-place

// compute set difference with other graph
$graph->copyExcept($otherGraph); // immutable
$graph->delete($otherGraph); // in-place

$serializer = new quickRdfIo\TurtleSerializer();
$stream = fopen('pathToOutputTurtleFile', 'w');
$serializer->serializeStream($stream, $graph);
fclose($stream);