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Fix odd case in fromRdf where rdf:nil is not used in a list, but is a vocabulary item, such as in the RDF vocabulary definition.
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‎example-files/arnaud-lang.rb‎

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#!/usr/bin/env ruby
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require 'json/ld'
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context = JSON.parse %({
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"@vocab": "http://schema.org/" ,
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"dc": "http://purl.org/dc/elements/1.1/",
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"doag": "http://academy.dior.com/doag#",
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"dior": "http://academy.dior.com/terms#",
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"name": {
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"@container": "@language"
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}
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})
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puts JSON::LD::API.compact("http://semio.dydra.com/arnaudlevy/dior-academy/seasons.jsonld?auth_token=rcelIAhAcmnYXv2A2rZ7", context).to_json(JSON::LD::JSON_STATE)

‎example-files/rdf.ttl‎

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@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
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@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
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@prefix owl: <http://www.w3.org/2002/07/owl#> .
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@prefix dc: <http://purl.org/dc/elements/1.1/> .
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<http://www.w3.org/1999/02/22-rdf-syntax-ns#> a owl:Ontology ;
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dc:title "The RDF Concepts Vocabulary (RDF)" ;
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dc:description "This is the RDF Schema for the RDF vocabulary terms in the RDF Namespace, defined in RDF 1.1 Concepts." .
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rdf:HTML a rdfs:Datatype ;
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rdfs:subClassOf rdfs:Literal ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:seeAlso <http://www.w3.org/TR/rdf11-concepts/#section-html> ;
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rdfs:label "HTML" ;
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rdfs:comment "The datatype of RDF literals storing fragments of HTML content" .
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rdf:langString a rdfs:Datatype ;
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rdfs:subClassOf rdfs:Literal ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:seeAlso <http://www.w3.org/TR/rdf11-concepts/#section-Graph-Literal> ;
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rdfs:label "langString" ;
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rdfs:comment "The datatype of language-tagged string values" .
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rdf:PlainLiteral a rdfs:Datatype ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:subClassOf rdfs:Literal ;
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rdfs:seeAlso <http://www.w3.org/TR/rdf-plain-literal/> ;
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rdfs:label "PlainLiteral" ;
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rdfs:comment "The class of plain (i.e. untyped) literal values, as used in RIF and OWL 2" .
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rdf:type a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "type" ;
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rdfs:comment "The subject is an instance of a class." ;
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rdfs:range rdfs:Class ;
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rdfs:domain rdfs:Resource .
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rdf:Property a rdfs:Class ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "Property" ;
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rdfs:comment "The class of RDF properties." ;
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rdfs:subClassOf rdfs:Resource .
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rdf:Statement a rdfs:Class ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "Statement" ;
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rdfs:subClassOf rdfs:Resource ;
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rdfs:comment "The class of RDF statements." .
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rdf:subject a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "subject" ;
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rdfs:comment "The subject of the subject RDF statement." ;
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rdfs:domain rdf:Statement ;
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rdfs:range rdfs:Resource .
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rdf:predicate a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "predicate" ;
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rdfs:comment "The predicate of the subject RDF statement." ;
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rdfs:domain rdf:Statement ;
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rdfs:range rdfs:Resource .
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rdf:object a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "object" ;
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rdfs:comment "The object of the subject RDF statement." ;
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rdfs:domain rdf:Statement ;
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rdfs:range rdfs:Resource .
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rdf:Bag a rdfs:Class ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "Bag" ;
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rdfs:comment "The class of unordered containers." ;
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rdfs:subClassOf rdfs:Container .
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rdf:Seq a rdfs:Class ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "Seq" ;
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rdfs:comment "The class of ordered containers." ;
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rdfs:subClassOf rdfs:Container .
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rdf:Alt a rdfs:Class ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "Alt" ;
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rdfs:comment "The class of containers of alternatives." ;
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rdfs:subClassOf rdfs:Container .
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rdf:value a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "value" ;
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rdfs:comment "Idiomatic property used for structured values." ;
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rdfs:domain rdfs:Resource ;
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rdfs:range rdfs:Resource .
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rdf:List a rdfs:Class ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "List" ;
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rdfs:comment "The class of RDF Lists." ;
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rdfs:subClassOf rdfs:Resource .
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rdf:nil a rdf:List ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "nil" ;
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rdfs:comment "The empty list, with no items in it. If the rest of a list is nil then the list has no more items in it." .
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rdf:first a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "first" ;
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rdfs:comment "The first item in the subject RDF list." ;
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rdfs:domain rdf:List ;
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rdfs:range rdfs:Resource .
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rdf:rest a rdf:Property ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "rest" ;
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rdfs:comment "The rest of the subject RDF list after the first item." ;
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rdfs:domain rdf:List ;
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rdfs:range rdf:List .
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rdf:XMLLiteral a rdfs:Datatype ;
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rdfs:subClassOf rdfs:Literal ;
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rdfs:isDefinedBy <http://www.w3.org/1999/02/22-rdf-syntax-ns#> ;
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rdfs:label "XMLLiteral" ;
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rdfs:comment "The datatype of XML literal values." .

‎lib/json/ld/from_rdf.rb‎

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next unless nil_var = graph_object[RDF.nil.to_s]
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# For each item usage in the usages member of nil, perform the following steps:
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nil_var[:usages].each do |usage|
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nil_var.fetch(:usages, []).each do |usage|
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node, property, head = usage[:node], usage[:property], usage[:value]
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list, list_nodes = [], []
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