Lists all IPTC Record 1 (Envelope) DataSet tags.

Values:

IGMDTAG_ID_IPTC_ENV_MODEL_VERSION	Model version.
IGMDTAG_ID_IPTC_ENV_DESTINATION	Destination information (additional routing information.
IGMDTAG_ID_IPTC_ENV_FILE_FORMAT	File format.
IGMDTAG_ID_IPTC_ENV_FILE_FORMAT_VERSION	File format version.
IGMDTAG_ID_IPTC_ENV_SERVICE_IDENTIFIER	Service identifier.
IGMDTAG_ID_IPTC_ENV_ENVELOPE_NUMBER	Envelope number.
IGMDTAG_ID_IPTC_ENV_PRODUCT_ID	Product ID.
IGMDTAG_ID_IPTC_ENV_ENVELOPE_PRIORITY	Envelope priority.
IGMDTAG_ID_IPTC_ENV_DATE_SENT	Date sent.
IGMDTAG_ID_IPTC_ENV_TIME_SENT	Time sent.
IGMDTAG_ID_IPTC_ENV_CODED_CHARACTER_SET	Coded character set.
IGMDTAG_ID_IPTC_ENV_UNO	Unique Name of Object.
IGMDTAG_ID_IPTC_ENV_ARM_IDENTIFIER	ARM identifier.
IGMDTAG_ID_IPTC_ENV_ARM_VERSION	ARM version.