<s>
XHTML	B-General_Concept
Friends	I-General_Concept
Network	I-General_Concept
(	O
XFN	O
)	O
is	O
an	O
HTML	B-Language
microformat	B-General_Concept
developed	O
by	O
Global	O
Multimedia	O
Protocols	O
Group	O
that	O
provides	O
a	O
simple	O
way	O
to	O
represent	O
human	O
relationships	O
using	O
links	O
.	O
</s>
<s>
XFN	O
enables	O
web	O
authors	O
to	O
indicate	O
relationships	O
to	O
the	O
people	O
in	O
their	O
blogrolls	O
by	O
adding	O
one	O
or	O
more	O
keywords	O
as	O
the	O
rel	B-General_Concept
attribute	I-General_Concept
to	O
their	O
links	O
.	O
</s>
<s>
XFN	O
was	O
the	O
first	O
microformat	B-General_Concept
,	O
introduced	O
in	O
December	O
2003	O
.	O
</s>
