':return:
A concatenation of the native values of the contained chunks'

def _merge_chunks(self):

    if (not self._indefinite):
        return self._as_chunk()
    pointer = self._chunks_offset
    contents_len = len(self.contents)
    output = None
    while (pointer < contents_len):
        (sub_value, pointer) = _parse_build(self.contents, pointer, spec=self.__class__)
        if (output is None):
            output = sub_value._merge_chunks()
        else:
            output += sub_value._merge_chunks()
    if (output is None):
        return self._as_chunk()
    return output
