LDP: Linked Data Platform

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https://www.w3.org/TR/ldp/

PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT ?name (COUNT(?friend) AS ?count)
WHERE {
    ?person foaf:name ?name .
    ?person foaf:knows ?friend .
} GROUP BY ?person ?name

Alice 3 ^^xsd:integer
Bob 1 ^^xsd:integer
Charlie 1 ^^xsd:integer

alice.ttl

@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

<http://example.org/alice#me> a foaf:Person .
<http://example.org/alice#me> foaf:name "Alice" .
<http://example.org/alice#me> foaf:mbox <mailto:alice@example.org> .
<http://example.org/alice#me> foaf:knows <http://example.org/bob#me> .
<http://example.org/bob#me> foaf:knows <http://example.org/alice#me> .
<http://example.org/bob#me> foaf:name "Bob" .
<http://example.org/alice#me> foaf:knows <http://example.org/charlie#me> .
<http://example.org/charlie#me> foaf:knows <http://example.org/alice#me> .
<http://example.org/charlie#me> foaf:name "Charlie" .
<http://example.org/alice#me> foaf:knows <http://example.org/snoopy> .
<http://example.org/snoopy> foaf:name "Snoopy"@en .

一些格式
application/ld+json
application/rdf+json
application/rdf+xml
application/trix
application/x-trig
application/x-turtle
application/xhtml+xml
application/xml
text/html
text/n3
text/plain
text/rdf+n3
text/turtle

rdf+xml

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
xmlns:context="http://localhost:8080/context/"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:foaf="http://xmlns.com/foaf/0.1/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<rdf:Description rdf:about="http://example.org/alice#me">
<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/>
<foaf:name>Alice</foaf:name>
<foaf:mbox rdf:resource="mailto:alice@example.org"/>
<foaf:knows rdf:resource="http://example.org/bob#me"/>
</rdf:Description>

<rdf:Description rdf:about="http://example.org/bob#me">
<foaf:knows rdf:resource="http://example.org/alice#me"/>
<foaf:name>Bob</foaf:name>
</rdf:Description>

<rdf:Description rdf:about="http://example.org/alice#me">
<foaf:knows rdf:resource="http://example.org/charlie#me"/>
</rdf:Description>

<rdf:Description rdf:about="http://example.org/charlie#me">
<foaf:knows rdf:resource="http://example.org/alice#me"/>
<foaf:name>Charlie</foaf:name>
</rdf:Description>

<rdf:Description rdf:about="http://example.org/alice#me">
<foaf:knows rdf:resource="http://example.org/snoopy"/>
</rdf:Description>

<rdf:Description rdf:about="http://example.org/snoopy">
<foaf:name xml:lang="en">Snoopy</foaf:name>
</rdf:Description>

</rdf:RDF>

turtle

@prefix context: <http://localhost:8080/context/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .

<http://example.org/alice#me> a foaf:Person ;
foaf:name "Alice" ;
foaf:mbox <mailto:alice@example.org> ;
foaf:knows <http://example.org/bob#me> .

<http://example.org/bob#me> foaf:knows <http://example.org/alice#me> ;
foaf:name "Bob" .

<http://example.org/alice#me> foaf:knows <http://example.org/charlie#me> .

<http://example.org/charlie#me> foaf:knows <http://example.org/alice#me> ;
foaf:name "Charlie" .

<http://example.org/alice#me> foaf:knows <http://example.org/snoopy> .

<http://example.org/snoopy> foaf:name "Snoopy"@en .

ld+json

[ {
"@graph" : [ {
    "@id" : "http://example.org/alice#me",
    "@type" : [ "http://xmlns.com/foaf/0.1/Person" ],
    "http://xmlns.com/foaf/0.1/knows" : [ {
      "@id" : "http://example.org/bob#me"
    }, {
      "@id" : "http://example.org/charlie#me"
    }, {
      "@id" : "http://example.org/snoopy"
    } ],
    "http://xmlns.com/foaf/0.1/mbox" : [ {
      "@id" : "mailto:alice@example.org"
    } ],
    "http://xmlns.com/foaf/0.1/name" : [ {
      "@value" : "Alice"
    } ]
}, {
    "@id" : "http://example.org/bob#me",
    "http://xmlns.com/foaf/0.1/knows" : [ {
      "@id" : "http://example.org/alice#me"
    } ],
    "http://xmlns.com/foaf/0.1/name" : [ {
      "@value" : "Bob"
    } ]
}, {
    "@id" : "http://example.org/charlie#me",
    "http://xmlns.com/foaf/0.1/knows" : [ {
      "@id" : "http://example.org/alice#me"
    } ],
    "http://xmlns.com/foaf/0.1/name" : [ {
      "@value" : "Charlie"
    } ]
}, {
    "@id" : "http://example.org/snoopy",
    "http://xmlns.com/foaf/0.1/name" : [ {
      "@language" : "en",
      "@value" : "Snoopy"
    } ]
} ],
"@id" : "http://localhost:8080/context/default"
} ]

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