JSON-LD: JSON for the Social Web

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Short presentation on JSON-LD for the W3C Social Standards Workshop held in San Francisco in August 2013.

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  • JSON-LD brings a standard representation for expressing entity-value relationships using a few standard keywords and a consistent organizational structure for JSON Objects. Objects represent entities, with keys acting as properties. Properties always expand to full IRIs. Arrays express a set of values associated with a property, unordered by default. Order expressed in @context or as an expanded value representation. Values are Object, string or native, with standard XSD representations for native types. Expanded form allows for more datatype and language variations.
  • Subject reference identifies an object with @id in the same document, or references an external document (Linked Data).
  • Full transformation from and to the RDF data model as a normative part of the API.
  • JSON-LD: JSON for the Social Web

    1. 1. JSON-LD JSON for the Social Web Gregg Kellogg gregg@greggkellogg.net @gkellogg Wednesday, August 7, 13
    2. 2. Introducing JSON-LD JSON-based syntax to express linked data @context @id @type @value @language @graph @list @set Wednesday, August 7, 13
    3. 3. { "@context": "http://json-ld.org/contexts/person", "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": "http://www.markus-lanthaler.com/" } •Make full use of JSON syntactic representations • Object defines a node definition Language Principles • Define referenced node definition with chaining { "@context": "http://json-ld.org/contexts/person", "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": { "@id": "http://www.markus-lanthaler.com/", "@type": "Person", "name": "Markus Lanthaler", "knows" "http://greggkellogg.net/foaf#me" } } Wednesday, August 7, 13
    4. 4. { "@id": "http://greggkellogg.net/foaf#me", "@type": "http://schema.org/Person", "http://schema.org/name": "Gregg Kellogg", "http://schema.org/knows": { "@id": "http://www.markus-lanthaler.com/" } } • Define terms to use short property names • Associate types for property values { "@context": "http://json-ld.org/contexts/person", "id": "http://greggkellogg.net/foaf#me", "type": "Person", "name": "Gregg Kellogg", "knows": "http://www.markus-lanthaler.com/" } { "@context": { "@vocab": "http://schema.org/", "knows”: {"@type": "@id"}, "id”: "@id", "type”: "@type" } } Language Principles Wednesday, August 7, 13
    5. 5. • Define referenced node definition with chaining { "@context": "http://json-ld.org/contexts/person", "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": { "@id": "http://www.markus-lanthaler.com/", "@type": "Person", "name": "Markus Lanthaler", "knows" "http://greggkellogg.net/foaf#me" } } { "@context": "http://json-ld.org/contexts/person", "@graph": [{ "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": "http://www.markus-lanthaler.com/" }, { "@id": "http://www.markus-lanthaler.com/", "@type": "Person", "name": "Markus Lanthaler", "knows" "http://greggkellogg.net/foaf#me" }] } Wednesday, August 7, 13
    6. 6. • More features defined in the syntax specification*: • Ordered Lists, Compact IRIs, Unlabeled Nodes, Reverse Properties, Language Maps, Data Indexing • Embedded @context definitions • Datasets/Named Graphs * http://www.w3.org/TR/json-ld/ Language Principles Wednesday, August 7, 13
    7. 7. It’s just JSON {    "verb":  "post",    "published":  "2011-­‐02-­‐10T15:04:55Z",    "language":  "en",    "actor":  {        "objectType":  "person",        "id":  "urn:example:person:marCn",        "displayName":  "MarCn  Smith",        "url":  "hGp://example.org/marCn",        "image":  {            "url":  "hGp://example.org/marCn/image.jpg",            "mediaType":  "image/jpeg",            "width":  250,            "height":  250        }    },    "object"  :  {        "objectType":  "arCcle",        "id":  "urn:example:blog:abc123/xyz",        "url":  "hGp://example.org/blog/2011/02/entry",        "displayName":  "Why  I  love  AcCvity  Streams"    },    "target"  :  {        "objectType":  "blog",        "id":  "urn:example:blog:abc123",        "displayName":  "MarCn's  Blog",        "url":  "hGp://example.org/blog/"    } } • Express structured data using regular JSON idioms. • Use external @context to alias terms and cast types Wednesday, August 7, 13
    8. 8. RDF  { "@context": "http://json-ld.org/contexts/person", "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": { "@id": "http://www.markus-lanthaler.com/", "@type": "Person", "name": "Markus Lanthaler", "knows" "http://greggkellogg.net/foaf#me" } } Wednesday, August 7, 13
    9. 9. RDF  { "@context": "http://json-ld.org/contexts/person", "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": { "@id": "http://www.markus-lanthaler.com/", "@type": "Person", "name": "Markus Lanthaler", "knows" "http://greggkellogg.net/foaf#me" } } Wednesday, August 7, 13
    10. 10. RDF  { "@context": "http://json-ld.org/contexts/person", "@id": "http://greggkellogg.net/foaf#me", "@type": "Person", "name": "Gregg Kellogg", "knows": { "@id": "http://www.markus-lanthaler.com/", "@type": "Person", "name": "Markus Lanthaler", "knows" "http://greggkellogg.net/foaf#me" } } @prefix: schema <http://schema.org/> . <http://greggkellogg.net/foaf#me> a schema:Person; schema:name “Gregg Kellogg”; shema:knows <http://www.markus-lanthaler.com/> . <http://www.markus-lanthaler.com/> a schema:Person schema:name “Markus Lanthaler” schema:knows <http://greggkellogg.net/foaf#me> . Wednesday, August 7, 13
    11. 11. More Information json-ld.org w3c JavaScript Ruby Python Java PHP Gregg Kellogg @gkellogg gregg@greggkellogg.net http://greggkellogg.net/ http://www.slideshare.net/gkellogg1/open-social2013 Wednesday, August 7, 13

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