<s>
This	O
is	O
a	O
list	B-Language
of	I-Language
markup	I-Language
languages	I-Language
.	O
</s>
<s>
List	B-Language
of	I-Language
document	I-Language
markup	I-Language
languages	I-Language
--	O
This	O
term	O
is	O
often	O
used	O
synonymously	O
with	O
"	O
markup	O
language	O
"	O
,	O
presumably	O
because	O
document	O
can	O
refer	O
to	O
any	O
written	O
or	O
recorded	O
representation	O
.	O
</s>
<s>
List	B-Language
of	I-Language
XML	I-Language
markup	I-Language
languages	I-Language
--	O
XML	B-Protocol
itself	O
is	O
properly	O
a	O
meta-language	O
used	O
to	O
define	O
other	O
markup	O
languages	O
.	O
</s>
