xcoffins – Rich boxed ma­te­rial for LaTeX 3

Coffins are boxes which con­tain type­set ma­te­rial. Along with the box it­self, the cof­fin struc­ture holds in­for­ma­tion about the size and shape of the box, and align­ment in­for­ma­tion in the form of a set of “poles” (hor­i­zon­tal and ver­ti­cal lines at par­tic­u­lar po­si­tions de­fined rel­a­tive to the box). The points where these poles in­ter­sect are “han­dles”, which are the points used to de­fine the plac­ing of a cof­fin.
The pack­age pro­vides a de­sign-level in­ter­face to the LaTeX 3 ker­nel func­tions which pro­vide coffins.
The pack­age is part of the l3­ex­per­i­men­tal bun­dle, and de­rives from a snap­shot of the LaTeX 3 repos­i­tory taken on 2012-07-16.