<s>
LEXX	B-Application
is	O
a	O
text	B-Application
editor	I-Application
which	O
was	O
possibly	O
the	O
first	O
to	O
use	O
live	O
parsing	O
and	O
colour	O
syntax	O
highlighting	O
.	O
</s>
<s>
The	O
name	O
was	O
chosen	O
because	O
he	O
wrote	O
it	O
as	O
a	O
tool	O
for	O
lexicographers	O
,	O
during	O
an	O
assignment	O
for	O
Oxford	O
University	O
Press	O
's	O
'	O
New	O
Oxford	B-Application
English	I-Application
Dictionary	I-Application
 '	O
(	O
NOED	O
;	O
the	O
second	O
edition	O
of	O
the	B-Application
Oxford	I-Application
English	I-Application
Dictionary	I-Application
)	O
.	O
</s>
<s>
The	O
program	O
ran	O
(	O
and	O
still	O
,	O
in	O
2018	O
,	O
runs	O
)	O
on	O
mainframes	O
under	O
VM/CMS	B-Application
.	O
</s>
<s>
LEXX	B-Application
's	O
design	O
was	O
based	O
on	O
several	O
other	O
editors	O
written	O
by	O
the	O
same	O
author	O
(	O
such	O
as	O
STET	B-Application
)	O
augmented	O
by	O
the	O
ability	O
to	O
dynamically	O
parse	O
text	O
and	O
display	O
colour	O
on	O
the	O
new	O
colour	O
terminals	O
that	O
had	O
recently	O
become	O
available	O
(	O
PC-based	O
,	O
and	O
stand-alone	O
such	O
as	O
the	O
IBM	O
3279	O
)	O
.	O
</s>
<s>
It	O
was	O
programmable	O
using	O
dynamically-loaded	O
compiled	O
commands	O
(	O
usually	O
written	O
in	O
PL/I	B-Language
)	O
or	O
using	O
interpreted	O
commands	O
(	O
usually	O
written	O
in	O
REXX	B-Language
--	O
hence	O
the	O
'	O
XX	O
 '	O
in	O
'	O
LEXX	B-Application
 '	O
)	O
.	O
</s>
<s>
LEXX	B-Application
uses	O
dynamically-loaded	O
parsers	O
which	O
assign	O
classes	O
of	O
elements	O
(	O
tokens	O
formed	O
from	O
character	O
strings	O
)	O
to	O
fonts	O
and	O
colors	O
.	O
</s>
<s>
LPEX	B-Application
( 	O
 '	O
Live	O
Parsing	O
Editor	O
"	O
)	O
is	O
a	O
reimplemented	O
derivative	O
of	O
the	O
LEXX	B-Application
concept	O
,	O
originally	O
produced	O
for	O
OS/2	B-Application
and	O
AIX	B-Application
.	O
</s>
