code: function parseGraph (rdf, baseUrl, rdfSource, contentType) {
    let parsedGraph = rdf.graph()
  
    rdf.parse(rdfSource, parsedGraph, baseUrl, contentType)
  
    return parsedGraph
  }
docs: Parses a given graph, from text rdfSource, as a given content type.
  Returns parsed graph.
  
  @method parseGraph
  @param rdf {RDF} RDF library such as rdflib.js
  @param baseUrl {string}
  @param rdfSource {string} Text source code
  @param contentType {string} Mime Type (determines which parser to use)
  
  @return {Graph}