JSON :: JenaX Extension Functions

PREFIX json: <http://jsa.aksw.org/fn/json/>
PREFIX norse: <https://w3id.org/aksw/norse#>

• array
  function
  create a JSON array from arguments

  BIND(json:array(?node1, ?node2, ..., ?nodeN) as ?jsonArray)
  

  norse:json
• binaryString
  function
  returns a string representation of the number as binary (base 2)

  BIND(json:binaryString(?number) as ?binaryString)
  

• convert
  function
  wrap the node in as JSON element

  BIND(json:convert(?node) as ?json)
  

  norse:json
• entries
  function
  transform a JSON object into a array of objects with key and value attributes

  BIND(json:entries(?jsonIn) as ?jsonOut)
  

  norse:json
• explode
  property function
  inject all keys of a JSON object as SPARQL variables

  VALUES ?json { "{'a': 2, 'b': 5}"^^norse:json }
  ?json json:explode ("json_") .
  # now do something with ?json_a and ?json_b
  

  VALUES ?json { "[ 2, 5 ]"^^norse:json }
  ?json json:explode ("json_" 1) .
  # now do something with ?json_1 and ?json_2
  

  Note: these variables will not show up in with SELECT *
• get
  function
  get element of JSON object or array

  BIND(json:get(?json, ?key) as ?element)
  

  BIND(json:get(?json, ?index) as ?element)
  

• length
  function
  get size of JSON array

  BIND(json:length(?array) as ?length)
  

  xsd:int
• object
  function
  create a JSON object from arguments

  BIND(json:object(?key1 ?val1 ?key2 ?val2 ... ?keyN ?valN) as ?jsonObject)
  

  norse:json
• path
  function
  access JSON object by path

  BIND(json:path(?json, ?path) as ?element)
  

• reverse
  function
  reverse JSON array

  BIND(json:reverse(?jsonArray) as ?reverseJsonArray)
  

  norse:json
• set
  function
  set a key to a value on a JSON object

  BIND(json:set(?jsonObject, ?key, ?value) as ?newJsonObject)
  

  norse:json
• split
  function
  split a string into a JSON array

  BIND(json:split(?string, ?separator) as ?jsonArray)
  

  norse:json
• unnest
  property function
  unnest JSON array into many bindings

  SELECT * {
    ?jsonArray json:unnest (?element ?index) .
  }
  

  SELECT * {
    BIND(json:entries(?jsonObject) as ?jsonEntries)
    ?jsonEntries array:unnest (?entry) .
    BIND(json:get(?entry, "key") as ?key)
    BIND(json:get(?entry, "value") as ?value)
  }