Perplexed? - UK official document definitions

A calendar is a precis, usually in English, full enough for most purposes to replace the original document.
A roll, such as a charter or patent roll was formed by sewing together end to end copies, usually on sheets of development, of charters, patents, etc., and rolling them up as a method of preserving records, in medieval times.
State papers are, in principal, the documents accumulating in the offices of the Secretaries of State from the accession of Henry VIII on.
A writ could be a charter for a grant of land or liberty in perpetuity; or a royal letter conveying an order, a commission or information.

These are found in Great Britain Official Publications Collection Guide by Betty Deavy, published by the National Library of Canada in 1996