uniform "prune_proofs" for Thm_Node / PThm, but it is in conflict with export_proofs of re-used nodes;

tuned;

updated xml_size;

prefer named result;

more robust expose_proofs corresponding to register_proofs/consolidate_theory; expose_proofs of class algebra more aggresively, to ensure early export within original theory/session context;

expose derivations more thoroughly, notably for locale/class reasoning;

clarified errors;

determine proof boxes from exported proof (NB: thm_boxes is not sufficient due to OfClass proofs);

more operations;

tuned whitespace;