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RDF Dataset description to lodcloud JSON format

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rdf2lodcloud

RDF Dataset description to lodcloud JSON format

Usage

java -jar rdf2lodcloud.jar <input.ttl> <output.json>

Vocabularies

The follow vocabularies are used for the mapping:

Prefix Vocabulary URI
dct Dublin Core terms http://purl.org/dc/terms/
dcat Data Catalog Vocabulary http://www.w3.org/ns/dcat#
void Vocabulary of Interlinked Datasets http://rdfs.org/ns/void#
sd SPARQL service description http://www.w3.org/ns/sparql-service-description#
http HTTP in RDF http://www.w3.org/2011/http#
foaf Friend of a friend http://xmlns.com/foaf/0.1/
vcard Ontology for vCard http://www.w3.org/2006/vcard/ns#

Mapping

The following mapping is used:

JSON RDF property Comment
identifier dct:identifier also used as NAME
title dct:title
description dct:description including a language tag
license dct:license
website dcat:landingPage
links void:subset
- target void:target both target are stated in the Linkset, only the "to" target should be used
- value void:triples
sparql void:sparqlEndpoint details are normalised in sd:Service entries
- description dct:description
- title dct:title
- access_url sd:endpoint sd:endpoint IRI must be the same as the void:sparqlEndpoint IRI
- status http:sc "status" describes the http response code, so we can use http:sc, values are instances of http:StatusCode
owner dcat:publisher [discussion: maybe we should use prov, because "owner" is probably about the description not the dataset!]
- name foaf:name
- email foaf:mbox using an IRI starting with mailto:
image foaf:depiction [discussion: is this the best property?]
triples void:triples
full_download dcat:distribution
- status http:sc see above for usage instructions
- TITLE dct:title
- description dct:description
- media_type dcat:mediaType
- download_url dcat:downloadURL
other_download dcat:distribution
- status http:sc see above for usage instructions
- TITLE dct:title
- description dct:description
- media_type dcat:mediaType
- access_url dcat:accessURL
contact_point dcat:contactPoint
- name vcard:fn
- email vcard:hasEmail
example void:exampleResource
- status http:sc see above for usage instructions
- title dct:title
- description dct:description
- access_url "access_url" must be the same value as void:exampleResource
domain dcat:theme [discussion: the actual ConceptScheme doesn't exists as dereferenceable URI's - so which should we use??]
keywords dcat:keyword
namespace void:uriSpace
doi [unknown, always empty]

As is common in the RDF open world assumption, empty values ("") are understand as "don't know the value", and are ommitted from the RDF data.

example

Using a piece of the dbpedia entry in the lodcloud:

JSON lodcloud format

"dbpedia": {
  "links": [
    {
      "value": "86547",
      "target": "geonames-semantic-web"
    },
    {
      "value": "467101",
      "target": "w3c-wordnet"
    },
    {
      "value": "18100000",
      "target": "yago"
    }
  ],
  "license": "http://www.opendefinition.org/licenses/cc-by-sa",
  "sparql": [
    {
      "status": "OK",
      "description": "SPARQL endpoint",
      "title": "",
      "access_url": "http://dbpedia.org/sparql"
    }
  ],
  "owner": "",
  "image": "",
  "description": {
    "en": "DBpedia.org is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia and to link other datasets on the Web to Wikipedia data.\r\n\r\nThe English version of the DBpedia knowledge base currently describes 6.0M entities of which 4.6M have abstracts, 1.53M have geo coordinates and 1.6M depictions. In total, 5.2M resources are classified in a consistent ontology, consisting of 1.5M persons, 810K places (including 505K populated places), 490K works (including 135K music albums, 106K films and 20K video games), 275K organizations (including 67K companies and 53K educational institutions), 301K species and 5K diseases. The total number of resources in English DBpedia is 16.9M that, besides the 6.0M resources, includes 1.7M skos concepts (categories), 7.3M redirect pages, 260K disambiguation pages and 1.7M intermediate nodes.\r\n \r\nAltogether the DBpedia 2016-04 release consists of 9.5 billion (2015-10: 8.8 billion) pieces of information (RDF triples) out of which 1.3 billion (2015-10: 1.1 billion) were extracted from the English edition of Wikipedia, 5.0 billion (2015-04: 4.4 billion) were extracted from other language editions and 3.2 billion (2015-10: 3.2 billion) from DBpedia Commons and Wikidata. In general, we observed a growth in mapping-based statements of about 2%.\r\n \r\nThorough statistics can be found on the DBpedia website and general information on the DBpedia datasets here."
  },
  "triples": "9500000000",
  "website": "http://dbpedia.org/",
  "title": "DBpedia",
  "other_download": [
    {
      "status": "OK",
      "title": "",
      "media_type": "application/octet-stream",
      "access_url": "http://downloads.dbpedia.org/2016-04/dbpedia_2016-04.owl",
      "description": "RDF Schema"
    },
    {
      "status": "OK",
      "title": "",
      "media_type": "meta/void",
      "access_url": "http://dbpedia.org/void/Dataset",
      "description": "voiD description",
    },
    {
      "status": "FAIL (404)",
      "description": "Semantic Web Sitemap",
      "title": "",
      "media_type": "meta/sitemap",
      "access_url": "http://wiki.dbpedia.org/sitemap"
    }
  ],
  "contact_point": {
    "email": "[email protected]",
    "name": "DBpedia Team - http://wiki.dbpedia.org/Imprint"
  },
  "example": [],
  "keywords": [
    "crossdomain",
    "lod",
    "provenance-metadata",
    "published-by-producer",
    "wikipedia"
  ],
  "namespace": "http://dbpedia.org/resource/",
  "identifier": "dbpedia",
  "full_download": [
    {
      "status": "OK",
      "title": "",
      "media_type": "text/html",
      "description": "Download",
      "download_url": "http://downloads.dbpedia.org/"
    }
  ],
  "doi": "",
  "domain": "cross_domain"
}

RDF format

@prefix data <http://bp4mc2.org/example/dataset/>
@prefix service <http://bp4mc2.org/example/service/>
@prefix domain <http://bp4mc2.org/example/domain/>

dataset:dbpedia a void:Dataset;
  void:subset
    [
      void:triples 86547;
      void:target dataset:dbpedia, dataset:geonames-semantic-web
    ],
    [
      void:triples 467101;
      void:target dataset:dbpedia, dataset:w3c-wordnet
    ],
    [
      void:triples 18100000;
      void:target dataset:dbpedia, dataset:yago
    ];
  dct:license <http://www.opendefinition.org/licenses/cc-by-sa>;
  void:sparqlEndpoint <http://dbpedia.org/sparql>;
  dct:description "DBpedia.org is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia and to link other datasets on the Web to Wikipedia data.\r\n\r\nThe English version of the DBpedia knowledge base currently describes 6.0M entities of which 4.6M have abstracts, 1.53M have geo coordinates and 1.6M depictions. In total, 5.2M resources are classified in a consistent ontology, consisting of 1.5M persons, 810K places (including 505K populated places), 490K works (including 135K music albums, 106K films and 20K video games), 275K organizations (including 67K companies and 53K educational institutions), 301K species and 5K diseases. The total number of resources in English DBpedia is 16.9M that, besides the 6.0M resources, includes 1.7M skos concepts (categories), 7.3M redirect pages, 260K disambiguation pages and 1.7M intermediate nodes.\r\n \r\nAltogether the DBpedia 2016-04 release consists of 9.5 billion (2015-10: 8.8 billion) pieces of information (RDF triples) out of which 1.3 billion (2015-10: 1.1 billion) were extracted from the English edition of Wikipedia, 5.0 billion (2015-04: 4.4 billion) were extracted from other language editions and 3.2 billion (2015-10: 3.2 billion) from DBpedia Commons and Wikidata. In general, we observed a growth in mapping-based statements of about 2%.\r\n \r\nThorough statistics can be found on the DBpedia website and general information on the DBpedia datasets here."@en;
  void:triples 9500000000;
  dcat:landingPage <http://dbpedia.org/>;
  dct:title "DBpedia";
  dcat:distribution
    [
      http:sc <http://www.w3.org/2011/http-statusCodes#OK>;
      dcat:mediaType "application/octet-stream";
      dcat:accessURL <http://downloads.dbpedia.org/2016-04/dbpedia_2016-04.owl>;
      dct:description "RDF Schema"
    ],
    [
      http:sc <http://www.w3.org/2011/http-statusCodes#OK>;
      dcat:mediaType "meta/void";
      dcat:accessURL <http://dbpedia.org/void/Dataset>;
      dct:description "voiD description"
    ],
    [
      http:sc <http://www.w3.org/2011/http-statusCodes#NotFound">;
      dct:description "Semantic Web Sitemap",
      dcat:mediaType "meta/sitemap",
      dcat:accessURL "http://wiki.dbpedia.org/sitemap"
    ];
  dcat:contactPoint [
    vcard:hasEmail <[email protected]>;
    vcard:fn "DBpedia Team - http://wiki.dbpedia.org/Imprint"
  ];
  dcat:keyword
    "crossdomain",
    "lod",
    "provenance-metadata",
    "published-by-producer",
    "wikipedia";
  void:uriSpace "http://dbpedia.org/resource/";
  dct:identifier "dbpedia";
  dcat:distribution [
    http:sc <http://www.w3.org/2011/http-statusCodes#OK">;
    dcat:mediaType "text/html";
    dct:description "Download";
    dcat:downloadURL" <http://downloads.dbpedia.org/>
  ];
  dcat:theme domain:cross_domain
.
service:dbpedia a sd:Service;
  dct:description "SPARQL endpoint";
  sd:endpoint <http://dbpedia.org/sparql>;
  http:sc <http://www.w3.org/2011/http-statusCodes#OK>
.

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RDF Dataset description to lodcloud JSON format

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