GF_Err gf_isom_new_xml_subtitle_description(GF_ISOFile  *movie, u32 trackNumber,
        const char *xmlnamespace, const char *xml_schema_loc, const char *mimes,
        u32 *outDescriptionIndex)
{
	GF_TrackBox                 *trak;
	GF_Err                      e;
	u32                         dataRefIndex;
	GF_MetaDataSampleEntryBox *stpp;
	char *URLname = NULL;
	char *URNname = NULL;

	e = CanAccessMovie(movie, GF_ISOM_OPEN_WRITE);
	if (e) return e;

	trak = gf_isom_get_track_from_file(movie, trackNumber);
	if (!trak || !trak->Media) return GF_BAD_PARAM;

	switch (trak->Media->handler->handlerType) {
	case GF_ISOM_MEDIA_MPEG_SUBT:
	case GF_ISOM_MEDIA_META:
	case GF_ISOM_MEDIA_TEXT:
		break;
	default:
		return GF_BAD_PARAM;
	}

	if (!xmlnamespace) {
		GF_LOG(GF_LOG_WARNING, GF_LOG_PARSER, ("XML (Subtitle, Metadata or Text) SampleEntry: namespace is mandatory. Abort.\n"));
		return GF_BAD_PARAM;
	}

	//get or create the data ref
	e = Media_FindDataRef(trak->Media->information->dataInformation->dref, URLname, URNname, &dataRefIndex);
	if (e) return e;
	if (!dataRefIndex) {
		e = Media_CreateDataRef(movie, trak->Media->information->dataInformation->dref, URLname, URNname, &dataRefIndex);
		if (e) return e;
	}
	if (!movie->keep_utc)
		trak->Media->mediaHeader->modificationTime = gf_isom_get_mp4time();

	stpp = (GF_MetaDataSampleEntryBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_STPP);
	if (!stpp) return GF_OUT_OF_MEM;
	stpp->dataReferenceIndex = dataRefIndex;
	gf_list_add(trak->Media->information->sampleTable->SampleDescription->child_boxes, stpp);
	if (outDescriptionIndex) *outDescriptionIndex = gf_list_count(trak->Media->information->sampleTable->SampleDescription->child_boxes);

	stpp->xml_namespace = gf_strdup(xmlnamespace);
	if (xml_schema_loc) stpp->xml_schema_loc = gf_strdup(xml_schema_loc); //optional
	if (mimes) stpp->mime_type = gf_strdup(mimes); //optional
	return e;
}
GF_Err gf_isom_new_xml_subtitle_description(GF_ISOFile  *movie, u32 trackNumber,
        const char *xmlnamespace, const char *xml_schema_loc, const char *mimes,
        u32 *outDescriptionIndex)
{
	GF_TrackBox                 *trak;
	GF_Err                      e;
	u32                         dataRefIndex;
	GF_MetaDataSampleEntryBox *stpp;
	char *URLname = NULL;
	char *URNname = NULL;

	e = CanAccessMovie(movie, GF_ISOM_OPEN_WRITE);
	if (e) return e;

	trak = gf_isom_get_track_from_file(movie, trackNumber);
	if (!trak || !trak->Media) return GF_BAD_PARAM;

	switch (trak->Media->handler->handlerType) {
	case GF_ISOM_MEDIA_MPEG_SUBT:
	case GF_ISOM_MEDIA_META:
	case GF_ISOM_MEDIA_TEXT:
		break;
	default:
		return GF_BAD_PARAM;
	}

	if (!xmlnamespace) {
		GF_LOG(GF_LOG_WARNING, GF_LOG_PARSER, ("XML (Subtitle, Metadata or Text) SampleEntry: namespace is mandatory. Abort.\n"));
		return GF_BAD_PARAM;
	}

	 
	e = Media_FindDataRef(trak->Media->information->dataInformation->dref, URLname, URNname, &dataRefIndex);
	if (e) return e;
	if (!dataRefIndex) {
		e = Media_CreateDataRef(movie, trak->Media->information->dataInformation->dref, URLname, URNname, &dataRefIndex);
		if (e) return e;
	}
	if (!movie->keep_utc)
		trak->Media->mediaHeader->modificationTime = gf_isom_get_mp4time();

	stpp = (GF_MetaDataSampleEntryBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_STPP);
	if (!stpp) return GF_OUT_OF_MEM;
	stpp->dataReferenceIndex = dataRefIndex;
	gf_list_add(trak->Media->information->sampleTable->SampleDescription->child_boxes, stpp);
	if (outDescriptionIndex) *outDescriptionIndex = gf_list_count(trak->Media->information->sampleTable->SampleDescription->child_boxes);

	stpp->xml_namespace = gf_strdup(xmlnamespace);
	if (xml_schema_loc) stpp->xml_schema_loc = gf_strdup(xml_schema_loc);  
	if (mimes) stpp->mime_type = gf_strdup(mimes);  
	return e;
}