--- /dev/null
+
+<!--
+ File isobox.ent produced by the XSL script mmldtd.xsl
+ from input data in unicode.xml.
+
+ Please report any errors to
+ David Carlisle <davidc@nag.co.uk>.
+
+ The numeric character values assigned to each entity
+ (should) match either official Unicode assignments
+ or assignments provisionally allocated by the
+ Unicode Consortium based on the characters in the `STIX'
+ propsal for mathematics. Note that these assignments
+ have not been ratified by the corresponding ISO
+ committee and thus should be considered liable to
+ change.
+
+ Entity names in this file are derived from files carrying the
+ following notice:
+
+ (C) International Organization for Standardization 1986
+ Permission to copy in any form is granted for use with
+ conforming SGML systems and applications as defined in
+ ISO 8879, provided this notice is included in all copies.
+
+-->
+
+<!ENTITY boxdl "┐" ><!--lower left quadrant -->
+<!ENTITY boxdL "╕" ><!--lower left quadrant -->
+<!ENTITY boxDl "╖" ><!--lower left quadrant -->
+<!ENTITY boxDL "╗" ><!--lower left quadrant -->
+<!ENTITY boxdr "┌" ><!--lower right quadrant -->
+<!ENTITY boxdR "╒" ><!--lower right quadrant -->
+<!ENTITY boxDr "╓" ><!--lower right quadrant -->
+<!ENTITY boxDR "╔" ><!--lower right quadrant -->
+<!ENTITY boxh "─" ><!--horizontal line -->
+<!ENTITY boxH "═" ><!--horizontal line -->
+<!ENTITY boxhd "┬" ><!--lower left and right quadrants -->
+<!ENTITY boxhD "╥" ><!--lower left and right quadrants -->
+<!ENTITY boxHd "╤" ><!--lower left and right quadrants -->
+<!ENTITY boxHD "╦" ><!--lower left and right quadrants -->
+<!ENTITY boxhu "┴" ><!--upper left and right quadrants -->
+<!ENTITY boxhU "╨" ><!--upper left and right quadrants -->
+<!ENTITY boxHu "╧" ><!--upper left and right quadrants -->
+<!ENTITY boxHU "╩" ><!--upper left and right quadrants -->
+<!ENTITY boxul "┘" ><!--upper left quadrant -->
+<!ENTITY boxuL "╛" ><!--upper left quadrant -->
+<!ENTITY boxUl "╜" ><!--upper left quadrant -->
+<!ENTITY boxUL "╝" ><!--upper left quadrant -->
+<!ENTITY boxur "└" ><!--upper right quadrant -->
+<!ENTITY boxuR "╘" ><!--upper right quadrant -->
+<!ENTITY boxUr "╙" ><!--upper right quadrant -->
+<!ENTITY boxUR "╚" ><!--upper right quadrant -->
+<!ENTITY boxv "│" ><!--vertical line -->
+<!ENTITY boxV "║" ><!--vertical line -->
+<!ENTITY boxvh "┼" ><!--all four quadrants -->
+<!ENTITY boxvH "╪" ><!--all four quadrants -->
+<!ENTITY boxVh "╫" ><!--all four quadrants -->
+<!ENTITY boxVH "╬" ><!--all four quadrants -->
+<!ENTITY boxvl "┤" ><!--upper and lower left quadrants -->
+<!ENTITY boxvL "╡" ><!--upper and lower left quadrants -->
+<!ENTITY boxVl "╢" ><!--upper and lower left quadrants -->
+<!ENTITY boxVL "╣" ><!--upper and lower left quadrants -->
+<!ENTITY boxvr "├" ><!--upper and lower right quadrants -->
+<!ENTITY boxvR "╞" ><!--upper and lower right quadrants -->
+<!ENTITY boxVr "╟" ><!--upper and lower right quadrants -->
+<!ENTITY boxVR "╠" ><!--upper and lower right quadrants -->