Changes

var wbEStruct = ['claims.P3', 'mainsnak.datavalue.value', 'numeric-id'];  

var wbEStruct = ['claims.P3', 'mainsnak.datavalue.value', 'numeric-id'];  

function indexiterpolate(obj,i) {return obj[i]};

function indexinterpolate(obj,i) {return obj[i]};

function readpart(arr, read){

function readpart(arr, read){