Graph API

Objective:

to serve partial graphs from the triple store in JSON-LD format.

Operations Required:

A. query a node: web resource, keyword, entity using the SPARQL endpoint (/sparql?query=)

B. return the node object and its neighbouring nodes in JSON-LD

URIs:

• endpoint/list: a list of starting nodes
• endpoint/<id>: perform A and B

Example of partial graph:

/* Example of JSON representing the graph:
Three nodes:
A. Article
B. keyword
C. semantic entity.
Two edges:
A -> B
C -> B
*/

{
    "nodes": [
        {
          "@id": "/data/webresource/ahJkZXZ-Y2hyb25vc3RyaXBsZXNyGAsSC1dlYlJlc291cmNlGICAgICAxLkKDA", 
          "schema:url": {
            "@type": "schema:URL", 
            "@value": "http://funcube.org.uk/2015/03/09/solar-eclipse-march-20th-2015/"
          }, 
          "@type": "schema:Article", 
          "schema:headline": {
            "@type": "https://schema.org/Text", 
            "@value": "Solar Eclipse - March 20th 2015"
          }, 
          "uuid": 5882524647555072, 
          "schema:author": {
            "@type": "schema:Text", 
            "@value": "funcube.org.uk"
          }, 
          "schema:datePublished": {
            "@type": "schema:DateTime", 
            "@value": "2015-03-09T10:33:06"
          }, 
          "schema:about": {
            "@type": "schema:Text", 
            "@value": "We have a total solar eclipse coming up on March 20th which tracks across the North Atlantic and eventually covers a lot of the Arctic. It would seem that this will affect most spacecraft that are in a polar orbit to some extent as, at that sort of time, they would expect to be in sunlight [...]"
          }
        },
        {
          "@id": "lunar+eclipses",
          "@type": "chronos:keyword",
          "chronos:index": "lunar eclipses",
        },
        {
          "@id": "solarsystem:Moon",
          "uuid": 0000000000000002,
          "@type": [
            "astronomy:PlanetaryBody",
            "astronomy:Natural_satellite"
          ],
          "astronomy:orbitsPlanet": {
            "@id": "solarsystem:Earth"
          },
          "owl:sameAs": [
            {
              "@id": "http://live.dbpedia.org/data/Moon.ntriples"
            },
            {
              "@id": "http://sw.opencyc.org/2012/05/10/concept/en/MoonOfEarth"
            },
            {
              "@id": "http://umbel.org/umbel/rc/MoonOfEarth"
            }
          ],
          "rdf:label": "Moon"
        }

    ],
    "edges": [
        {
            "source": 5882524647555072,
            "destination": "lunar+eclipses",
            "type": "chronos:relConcept"
        },
        {
            "source": 0000000000000002,
            "destination": "lunar+eclipses",
            "type": "chronos:relConcept"
        },

    ]


}