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JavaScript

json =     {
  "head": {
    "vars": [ "uri" , "label" ]
  } ,
  "results": {
    "bindings": [
      {
        "uri": { "type": "uri" , "value": "http://tematres.befdata.biow.uni-leipzig.de/vocab/?tema=751" } ,
        "label": { "type": "literal" , "xml:lang": "en" , "value": "15n" }
      } ,
      {
        "uri": { "type": "uri" , "value": "http://tematres.befdata.biow.uni-leipzig.de/vocab/?tema=916" } ,
        "label": { "type": "literal" , "xml:lang": "en" , "value": "16s analysis" }
      } ,
      {
        "uri": { "type": "uri" , "value": "http://tematres.befdata.biow.uni-leipzig.de/vocab/?tema=622" } ,
        "label": { "type": "literal" , "xml:lang": "en" , "value": "16s rrna" }
      } ,
      {
        "uri": { "type": "uri" , "value": "http://tematres.befdata.biow.uni-leipzig.de/vocab/?tema=917" } ,
        "label": { "type": "literal" , "xml:lang": "en" , "value": "16s rrna gene analysis" }
      } ,
      {
        "uri": { "type": "uri" , "value": "http://tematres.befdata.biow.uni-leipzig.de/vocab/?tema=618" } ,
        "label": { "type": "literal" , "xml:lang": "en" , "value": "18s rdna" }
      }]}} ;


yourMap = [];
for(var i = 0; i < json.results.bindings.length; i++){ 

    yourMap[i]= [json.results.bindings[i].uri.value, json.results.bindings[i].label.value ];


}
console.log(yourMap);