code: def _valid_lsid(self):
          
          if not isinstance(self.lsid, str):
              raise TypeError("lsid is not a string, string expected: " + str(self.lsid))
  
          if self.lsid.count(':') != 4:
              raise ValueError("lsid contains incorrect number of colons, 4 expected: " + str(self.lsid))
  
          if self.lsid.split(':')[0].lower() != 'urn':
              raise ValueError("lsid does not begin with urn: " + str(self.lsid))
  
          # If an LSID authority is specified, check with the authority
          if self.lsid_authority:
              if not self.lsid_authority.validate(self.lsid, check_existing=False):
                  raise ValueError("lsid does not the authority: " + str(self.lsid))
docs: Performs some basic (non-comprehensive) LSID validation
          :return: