code: def decode_attr_elements(self, gexf_keys, obj_xml):
      # Use the key information to decode the attr XML
      attr = {}
      # look for outer '<attvalues>' element
      attr_element = obj_xml.find(f"{{{self.NS_GEXF}}}attvalues")
      if attr_element is not None:
          # loop over <attvalue> elements
          for a in attr_element.findall(f"{{{self.NS_GEXF}}}attvalue"):
              key = a.get("for")  # for is required
              try:  # should be in our gexf_keys dictionary
                  title = gexf_keys[key]["title"]
              except KeyError as err:
                  raise nx.NetworkXError(
                      f"No attribute defined for={key}."
                  ) from err
              atype = gexf_keys[key]["type"]
              value = a.get("value")
              if atype == "boolean":
                  value = self.convert_bool[value]
              else:
                  value = self.python_type[atype](value)
              if gexf_keys[key]["mode"] == "dynamic":
                  # for dynamic graphs use list of three-tuples
                  # [(value1,start1,end1), (value2,start2,end2), etc]
                  ttype = self.timeformat
                  start = self.python_type[ttype](a.get("start"))
                  end = self.python_type[ttype](a.get("end"))
                  if title in attr:
                      attr[title].append((value, start, end))
                  else:
                      attr[title] = [(value, start, end)]
              else:
                  # for static graphs just assign the value
                  attr[title] = value
      return attr
  
imports: import itertools
  import time
  from xml.etree.ElementTree import Element, ElementTree, SubElement, register_namespace, tostring
  import networkx
  from networkx.utils import open_file
label_desc: Use image node_id 11 for calling the GEXFReader obj's underlying member method code with example usage: obj.decode_attr_elements(gexf_keys, obj_xml) and returns: attr