%isobox; — Box and Line Drawing Character Entities
The %isobox;
parameter entity includes the ISO
character entities with the public identifier:
ISO 8879:1986//ENTITIES Box and Line Drawing//EN
ISO and the W3C are cooperating to provide an official set of character entity references for XML. A description of this set is available at http://www.w3.org/2003/entities/iso8879doc/isobox.html