Enumeration that determines attributes of UD item. Used by IG_REC_UD_item_add, IG_REC_UD_item_delete, IG_REC_UD_item_first_get, and IG_REC_UD_item_next_get.

Values:

IG_REC_UD_ITEM_ATTR_LITERAL_STRING	Denotes a literal string.
IG_REC_UD_ITEM_ATTR_REGULAR_EXPRESSION	Denotes a regular expression.