g_object_new (PSPPIRE_TYPE_DATA_SHEET,
"forward-conversion", psppire_data_store_value_to_string,
"reverse-conversion", myreversefunc,
g_object_new (PSPPIRE_TYPE_DATA_SHEET,
"forward-conversion", psppire_data_store_value_to_string,
"reverse-conversion", myreversefunc,