sesame芝麻开门RDF研究 1

最新推荐文章于 2019-06-03 11:11:18 发布

最新推荐文章于 2019-06-03 11:11:18 发布 · 250 阅读

文章标签：

#EXT #Gmail #XML #XHTML #HTML

本文通过一个简单的Java程序演示了使用sesame3alpha1库来生成不同格式的资源描述框架（RDF）。包括RDF/XML、N-Triples、Turtle、N3、TriX、TriG和RDFa等格式的输出示例。

下载了sesame 3alpha1,先写个小程序体验一下RDF的几种格式

static String NS = "http://www.steeven.org/rdf#";

public static void main(String[] args) throws RDFHandlerException {
	for (RDFFormat format : RDFFormat.values())
		writeRDF(format);
}

private static void writeRDF(RDFFormat format) throws RDFHandlerException {
	System.out.println("=======format: "+format+"========");
	RDFWriter w = Rio.createWriter(format, System.out);
	w.handleNamespace("myns", NS);
	w.handleNamespace("w3", RDFS.NAMESPACE);
	w.startRDF();
	w.handleComment("my first rdf file");

	BNode res = MemValueFactory.getInstance().createBNode(
			"steeven@gmail.com");
	w.handleStatement(MemValueFactory.getInstance().createStatement(res,
			RDFS.LABEL,
			MemValueFactory.getInstance().createLiteral("steeven")));
	w.handleStatement(MemValueFactory.getInstance().createStatement(res,
			MemValueFactory.getInstance().createURI(NS, "desc"),
			MemValueFactory.getInstance().createLiteral("good blogger")));
	w.endRDF();
	System.out.println("\n");
}

输出如下:

=======format: RDF/XML (mimeTypes=application/rdf+xml, application/xml; ext=rdf, rdfs, owl, xml)========
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
	xmlns:myns="http://www.steeven.org/rdf#"
	xmlns:w3="http://www.w3.org/2000/01/rdf-schema#"
	xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<!-- my first rdf file -->

<rdf:Description rdf:nodeID="steeven@gmail.com">
	<w3:label>steeven</w3:label>
	<myns:desc>good blogger</myns:desc>
</rdf:Description>

</rdf:RDF>

=======format: N-Triples (mimeTypes=text/plain; ext=nt)========
# my first rdf file
_:steeven@gmail.com <http://www.w3.org/2000/01/rdf-schema#label> "steeven" .
_:steeven@gmail.com <http://www.steeven.org/rdf#desc> "good blogger" .


=======format: Turtle (mimeTypes=application/x-turtle; ext=ttl)========
@prefix myns: <http://www.steeven.org/rdf#> .
@prefix w3: <http://www.w3.org/2000/01/rdf-schema#> .

# my first rdf file

_:steeven@gmail.com w3:label "steeven" ;
	myns:desc "good blogger" .


=======format: N3 (mimeTypes=text/rdf+n3; ext=n3)========
@prefix myns: <http://www.steeven.org/rdf#> .
@prefix w3: <http://www.w3.org/2000/01/rdf-schema#> .

# my first rdf file

_:steeven@gmail.com w3:label "steeven" ;
	myns:desc "good blogger" .


=======format: TriX (mimeTypes=application/trix; ext=xml, trix)========
<?xml version='1.0' encoding='UTF-8'?>
<TriX xmlns='http://www.w3.org/2004/03/trix/trix-1/'>
	<!-- my first rdf file -->
	<graph>
		<triple>
			<id>steeven@gmail.com</id>
			<uri>http://www.w3.org/2000/01/rdf-schema#label</uri>
			<plainLiteral>steeven</plainLiteral>
		</triple>
		<triple>
			<id>steeven@gmail.com</id>
			<uri>http://www.steeven.org/rdf#desc</uri>
			<plainLiteral>good blogger</plainLiteral>
		</triple>
	</graph>
</TriX>


=======format: TriG (mimeTypes=application/x-trig; ext=trig)========
@prefix myns: <http://www.steeven.org/rdf#> .
@prefix w3: <http://www.w3.org/2000/01/rdf-schema#> .

# my first rdf file

{
	_:steeven@gmail.com w3:label "steeven" ;
		myns:desc "good blogger" .
}


=======format: RDFa (mimeTypes=application/xhtml+xml; ext=xhtml)========
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
	 xmlns:myns="http://www.steeven.org/rdf#"
	 xmlns:w3="http://www.w3.org/2000/01/rdf-schema#">
<head>
<!-- my first rdf file -->
</head>
<body>
<div about="[_:steeven@gmail.com]">
	<span property="w3:label">steeven</span>
	<span property="myns:desc">good blogger</span>
</div>

</body>
</html>