code: def prefix(self, format="sparql"):
          ''' Generates a string of the rdf namespaces listed used in the
              framework
  
              format: "sparql" or "turtle"
          '''
  
          lg = logging.getLogger("%s.%s" % (self.ln, inspect.stack()[0][3]))
          lg.setLevel(self.log_level)
  
          _return_str = ""
          if format.lower() == "sparql":
              return "\n".join([ns._sparql_ for ns in self.namespaces])
          elif format.lower() in ["turtle", "ttl"]:
              return "\n".join([ns._ttl_ for ns in self.namespaces])
          elif format.lower() in ["rdf", "xml", "rdf/xml"]:
              return "<rdf:RDF %s>" % \
                      " ".join([ns._xml_ for ns in self.namespaces])
          else:
              raise NotImplementedError("'%s' is not a valid prefix type." %
                                        formatf prefix(self, format="sparql"):
          ''' Generates a string of the rdf namespaces listed used in the
              framework
  
              format: "sparql" or "turtle"
          '''
  
          lg = logging.getLogger("%s.%s" % (self.ln, inspect.stack()[0][3]))
          lg.setLevel(self.log_level)
  
          _return_str = ""
          if format.lower() == "sparql":
              return "\n".join([ns._sparql_ for ns in self.namespaces])
          elif format.lower() in ["turtle", "ttl"]:
              return "\n".join([ns._ttl_ for ns in self.namespaces])
          elif format.lower() in ["rdf", "xml", "rdf/xml"]:
              return "<rdf:RDF %s>" % \
                      " ".join([ns._xml_ for ns in self.namespaces])
          else:
              raise NotImplementedError("'%s' is not a valid prefix type." %
                                        format)
docs: Generates a string of the rdf namespaces listed used in the
              framework
  
              format: "sparql" or "turtle"