Definitions for "Wrappers"
The outer covers of a softcover book or pamphlet.
Not the dustjacket, but the paper binding or outer covers of a book. These covers are ‘wrapped' and glued around the block of the book.
paper covers, as opposed to a board. dealer catalogues usually describe paperbacks as "in wrappers".
In data mining and treatment learning, wrappers were used by Ron Kohavi and George John. Their idea was to wrap their treatments learners in a preprocessor that would search to make subsets from the current set of attributes.
An arrangement whereby an investment (usually a fund) is sold as an adjunct to a life insurance policy. Fund investors can shelter both capital gains and investment income from tax by making use of the wrappers available.
a little harder, since (as far as I can tell) there is no documentation on the format
Keywords:  see
See wraps.