'On record-valued keyword cards this is the name of the standard <= 8
character FITS keyword that this RVKC is stored in.  Otherwise it is
the card\'s normal keyword.'

@property
def rawkeyword(self):

    if (self._rawkeyword is not None):
        return self._rawkeyword
    elif (self.field_specifier is not None):
        self._rawkeyword = self.keyword.split('.', 1)[0]
        return self._rawkeyword
    else:
        return self.keyword
