Basic zone types.

Values:

IG_REC_WT_FLOW	Flowed text. This zone type means that the zone contains textual information without a table type structure inside. Also for CJK caharcters.
IG_REC_WT_TABLE	Table type zone. This type means that the zone contains a table, i.e., rows and columns.
IG_REC_WT_GRAPHIC	Graphic type zone. This type of zone contains graphics, i.e., this zone will not be recognized at all and all other recognition related settings will be ignored. The only reason to have such a zone is to save or export the image inside it.
IG_REC_WT_AUTO	IG_REC_zones_locate performs a parsing algorithm, and it may create several zones of types IG_REC_WT_FLOW, IG_REC_WT_TABLE, and IG_REC_WT_GRAPHIC.
IG_REC_WT_IGNORE	Ignore zone. IG_REC_zones_locate does not create any zones.
IG_REC_WT_FORM	Form zone. Logical Form Recognition will run within this zone. It indicates an unfilled form and it should be set in the user zone before running IG_REC_zones_locate. IG_REC_zones_locate creates one zone; the created zone will contain a description of the form objects.
IG_REC_WT_VERTTEXT	Vertical text. For CJK characters only.
IG_REC_WT_LEFTTEXT	Left rotated text. For Latin characters only.
IG_REC_WT_RIGHTTEXT	Right rotated text. For Latin characters only.