WebID by examples

Sample Graphs

Serializations Lineup

Of the serialisations listed below only RDF/XML and RDFa 1.0 are currently required by the WebID Spec. The listing below is to help us determine which of these formats could be potentially added to the required formats, or indeed if they could supplant one of them.

RDF/XML

<?xml version="1.0"?>
<rdf:RDF xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns:foaf="http://xmlns.com/foaf/0.1/" 
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:cert="http://www.w3.org/ns/auth/cert#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
 <foaf:Person rdf:about="https://bob.example/profile#me">
  <foaf:name>Bob</foaf:name>
  <foaf:knows rdf:resource="https://example.edu/p/Alois#MSc" />
  <cert:key>
   <cert:RSAPublicKey>
    <rdfs:label>made on 23 November 2011 on my laptop</rdfs:label>
    <cert:modulus rdf:datatype="http://www.w3.org/2001/XMLSchema#hexBinary">cb24ed85d64d794b69c70...</cert:modulus>
    <cert:exponent rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">65537</cert:exponent>
   </cert:RSAPublicKey>
  </cert:key>
 </foaf:Person>
</rdf:RDF>

Spec: http://www.w3.org/TR/REC-rdf-syntax/

Libs:

C: http://librdf.org/ Bindings:
- PHP: http://librdf.org/docs/php.html
- Python: http://librdf.org/docs/python.html
- Perl: http://librdf.org/docs/perl.html
- Ruby: http://librdf.org/docs/ruby.html
PHP: https://github.com/semsol/arc2/wiki
PHP: http://www.aelius.com/njh/easyrdf/
Python: http://www.rdflib.net/
Ruby: http://rdf.rubyforge.org/rdfxml/
Java: http://jrdf.sourceforge.net/
Java: http://jena.sourceforge.net/
C#: http://razor.occams.info/code/semweb/
JavaScript: http://code.google.com/p/rdfquery/
JavaScript: http://www.jibbering.com/rdf-parser/
JavaScript: https://github.com/linkeddata/rdflib.js
and many others

Turtle and N3

@prefix : <http://www.w3.org/ns/auth/cert#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix bob: <https://bob.example/profile#> .
@prefix rdfs: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

bob:me a foaf:Person;
  foaf:name "Bob";
  foaf:knows <https://example.edu/p/Alois#MSc>;
  :key [ a :RSAPublicKey;
    rdfs:label "made on 23 November 2011 on my laptop";
    :modulus "cb24ed85d64d794b69c70..."^^xsd:hexBinary;
    :exponent 65537 ;
   ] .

N3 spec: http://www.w3.org/TeamSubmission/n3/
Turtle spec: http://www.w3.org/TR/turtle/

Libs:

C: http://librdf.org/ Bindings:
- PHP: http://librdf.org/docs/php.html
- Python: http://librdf.org/docs/python.html
- Perl: http://librdf.org/docs/perl.html
- Ruby: http://rdf.rubyforge.org/n3/
PHP: https://github.com/semsol/arc2/wiki
PHP: http://www.aelius.com/njh/easyrdf/
Python: http://www.rdflib.net/
Ruby: http://rdf.rubyforge.org/rdfxml/
Java: http://jrdf.sourceforge.net/
Java: http://jena.sourceforge.net/
C#: http://razor.occams.info/code/semweb/
JavaScript: http://code.google.com/p/rdfquery/
JavaScript: http://www.jibbering.com/rdf-parser/
JavaScript: https://github.com/linkeddata/rdflib.js
and many others

N-Triples

<https://bob.example/profile#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person>.
<https://bob.example/profile#me> <http://xmlns.com/foaf/0.1/name> "Bob".
<https://bob.example/profile#me> <http://xmlns.com/foaf/0.1/knows> <https://example.edu/p/Alois#MSc>.
_:a <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/auth/cert#RSAPublicKey>.
_:a <http://www.w3.org/1999/02/22-rdf-syntax-ns#label> "made on 23 November 2011 on my laptop".
_:a <http://www.w3.org/ns/auth/cert#modulus> "cb24ed85d64d794b69c70..."^^<http://www.w3.org/2001/XMLSchema#hexBinary>.
_:a <http://www.w3.org/ns/auth/cert#exponent> "65537"^^<http://www.w3.org/2001/XMLSchema#integer>.
<https://bob.example/profile#me> <http://www.w3.org/ns/auth/cert#key> _:a.

Spec: http://www.w3.org/TR/rdf-testcases/#ntriples

Libs:

C: http://librdf.org/ Bindings:
- PHP: http://librdf.org/docs/php.html
- Python: http://librdf.org/docs/python.html
- Perl: http://librdf.org/docs/perl.html
- Ruby: http://librdf.org/docs/ruby.html
PHP: https://github.com/semsol/arc2/wiki
PHP: http://www.aelius.com/njh/easyrdf/
Python: http://www.rdflib.net/
Ruby: http://rdf.rubyforge.org/RDF/NTriples.html
Java: http://jrdf.sourceforge.net/
Java: http://jena.sourceforge.net/
C#: http://razor.occams.info/code/semweb/
and many others

RDFa 1.0

<div
xmlns:cert="http://www.w3.org/ns/auth/cert#"
xmlns:foaf="http://xmlns.com/foaf/0.1/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
about="#me" typeof="foaf:Person"
>
 <span property="foaf:name">Bob</span>
 <h1>My Good Friends</h1>
 <ul>
  <li rel="foaf:knows" href="https://example.edu/p/Alois#MSc">Alois</li>
 </ul>
 <h1>My RSA Public Keys</h1>
 <div rel="cert:key">
  <div typeof="cert:RSAPublicKey">
  <p property="rdfs:label">made on 23 November 2011 on my laptop</p>
    <dl>
     <dt>Modulus (hexadecimal)</dt>
     <dd property="cert:modulus" datatype="xsd:hexBinary">cb24ed85d64d794b69c70...</dd>
     <dt>Exponent (decimal)</dt>
     <dd property="cert:exponent" datatype="xsd:int">65537</dd>
    </dl>
   </div>
 </div>
</div>

Spec: http://www.w3.org/TR/rdfa-syntax/

Libs:

C: http://librdf.org/ Bindings:
- PHP: http://librdf.org/docs/php.html
- Python: http://librdf.org/docs/python.html
- Perl: http://librdf.org/docs/perl.html
- Ruby: http://librdf.org/docs/ruby.html
Python: http://www.rdflib.net/
Ruby: http://rdf.rubyforge.org/rdfa/
Perl: http://search.cpan.org/dist/RDF-RDFa-Parser/
JavaScript: http://code.google.com/p/rdfquery/wiki/Introduction
JavaScript: http://www.jibbering.com/rdf-parser/
JavaScript: https://github.com/linkeddata/rdflib.js
Java:
- http://www-sop.inria.fr/teams/edelweiss/wiki/wakka.php?wiki=RDFaParser
- Shellacs' parser for Jena and Sesame https://github.com/shellac/java-rdfa
and many others

RDFa 1.1

<div about="#me" typeof="foaf:Person"
vocab="http://www.w3.org/ns/auth/cert#"
prefix="foaf: http://xmlns.com/foaf/0.1/
 rdfs: xmlnshttp://www.w3.org/2000/01/rdf-schema#
 xsd: http://www.w3.org/2001/XMLSchema#">
 <span property="foaf:name">Bob</span>
 <h1>My Good Friends</h1>
 <ul>
  <li rel="foaf:knows" href="https://example.edu/p/Alois#MSc">Alois</li>
 </ul>
 <h1>My RSA Public Keys</h1>
 <div rel="key">
  <div typeof="RSAPublicKey">
   <p property="rdfs:label">made on 23 November 2011 on my laptop</p>
   <dl>
    <dt>Modulus (hexadecimal)</dt>
    <dd property="modulus" datatype="xsd:hexBinary">cb24ed85d64d794b69c70...</dd>
    <dt>Exponent (decimal)</dt>
    <dd property="exponent" datatype="xsd:int">65537</dd>
   </dl>
  </div>
 </div>
</div>

Spec: http://www.w3.org/TR/rdfa-core/ (HTML: http://www.w3.org/TR/rdfa-in-html/ XHTML: http://www.w3.org/TR/xhtml-rdfa/ )

Some of libs that supported RDF 1.0 might support RDF 1.1.

JSON-LD

{
  "@context": {
    "cert": "http://www.w3.org/ns/auth/cert#",
    "foaf": "http://xmlns.com/foaf/0.1/",
    "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
    "@coerce": {
      "xsd:int": "cert:exponent",
      "@iri": [
        "cert:key",
        "foaf:knows"
      ],
      "xsd:hexBinary": "cert:modulus"
    }
  },
  "@subject": "#me",
  "@type": "foaf:Person",
  "cert:key": {
    "@type": "cert:RSAPublicKey",
    "cert:exponent": 65537,
    "cert:modulus": "cb24ed85d64d794b69c70...",
    "rdfs:label": "made on 23 November 2011 on my laptop"
  },
  "foaf:knows": "https://example.edu/p/Alois#MSc",
  "foaf:name": "Bob"
}

Spec: http://json-ld.org/spec/latest/json-ld-syntax/

Libs:

C++: https://github.com/digitalbazaar/monarch
PHP: https://github.com/digitalbazaar/php-json-ld
Python: https://github.com/bradleypallen/json_ld_processor
Ruby: https://github.com/gkellogg/json-ld/
JavaScript: https://github.com/digitalbazaar/jsonld.js

RDF/JSON

{
  "https://bob.example/profile#me" : {
      "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" : [ { "value" : "http://xmlns.com/foaf/0.1/Person", 
                                               "type" : "uri" } ] ,
      "http://xmlns.com/foaf/0.1/name" : [ { "value" : "Bob", 
                                             "type" : "literal" } ] ,
      "http://xmlns.com/foaf/0.1/knows" : [ { "value" : "https://example.edu/p/Alois#MSc", 
                                             "type" : "uri" } ] ,
      "http://www.w3.org/ns/auth/cert#key" : [ { "value" : "_:a", 
                                             "type" : "bnode" } ]
  } ,
  "_:a" : {
      "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" : [ { "value" : "http://www.w3.org/ns/auth/cert#RSAPublicKey", 
                                             "type" : "uri" } ] ,
      "http://www.w3.org/1999/02/22-rdf-syntax-ns#label" : [ { "value" : "made on 23 November 2011 on my laptop", 
                                             "type" : "literal" } ] ,
      "http://www.w3.org/ns/auth/cert#modulus" : [ { "value" : "cb24ed85d64d794b69c70...", 
                                             "type" : "literal",
                                             "datatype" : "http://www.w3.org/2001/XMLSchema#hexBinary" } ] ,
      "http://www.w3.org/ns/auth/cert#exponent" : [ { "value" : "65537", 
                                             "type" : "literal",
                                             "datatype" : "http://www.w3.org/2001/XMLSchema#integer" } ]
  }
}

Spec: https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-json/index.html (Editor's Draft)

It is under development so there aren't many libs. Additionally, there are a lot of RDF serializations which isn't compatible with RDF/JSON.

Microdata

<div itemscope="" itemtype="http://xmlns.com/foaf/0.1/Person">
  <div itemprop="http://www.w3.org/2000/01/rdf-schema#about">https://bob.example/profile#me</div>
  <h1>My Good Friends</h1>
  <div itemprop="http://xmlns.com/foaf/0.1/name">Bob</div>
  <div itemprop="http://xmlns.com/foaf/0.1/knows" itemscope="">Alois
    <div itemprop="http://www.w3.org/2000/01/rdf-schema#resource">https://example.edu/p/Alois#MSc</div>
  </div>
  <h1>My RSA Public Keys</h1>
  <div itemprop="http://www.w3.org/ns/auth/cert#key" itemscope="" itemtype="http://www.w3.org/ns/auth/cert#RSAPublicKey">
    <div itemprop="http://www.w3.org/2000/01/rdf-schema#label">made on 23 November 2011 on my laptop</div>
    <div itemprop="http://www.w3.org/ns/auth/cert#modulus" itemscope="">cb24ed85d64d794b69c70...
      <div itemprop="http://www.w3.org/2000/01/rdf-schema#datatype">http://www.w3.org/2001/XMLSchema#hexBinary</div>
    </div>
    <div itemprop="http://www.w3.org/ns/auth/cert#exponent" itemscope="">65537
      <div itemprop="http://www.w3.org/2000/01/rdf-schema#datatype">http://www.w3.org/2001/XMLSchema#integer</div>
    </div>
  </div>
</div>

Spec: http://www.w3.org/TR/microdata/

Issues: Issue 66 has been raised in support of Microdata for WebID profiles. http://www.w3.org/2005/Incubator/webid/track/issues/66

Libs:

PHP: https://github.com/soyrex/PHP-Microdata
JavaScript: https://gitorious.org/microdatajs/microdatajs