code: def _parseAttrVal(self, attrStr):
          
          m = self.SPLIT_ATTR_RE.match(attrStr)
          if m is None:
              raise GFF3Exception(
                  "can't parse attribute/value: '" + attrStr +
                  "'", self.fileName, self.lineNumber)
          name = urllib.unquote(m.group(1))
          val = m.group(2)
          # Split by comma to separate then unquote.
          # Commas in values must be url encoded.
          return name, [urllib.unquote(v) for v in val.split(',')]
docs: Returns tuple of tuple of (attr, value), multiple are returned to
          handle multi-value attributes.