<s>
A	O
link	B-General_Concept
relation	I-General_Concept
is	O
a	O
descriptive	O
attribute	O
attached	O
to	O
a	O
hyperlink	O
in	O
order	O
to	O
define	O
the	O
type	O
of	O
the	O
link	O
,	O
or	O
the	O
relationship	O
between	O
the	O
source	O
and	O
destination	O
resources	O
.	O
</s>
<s>
In	O
HTML	B-Language
these	O
are	O
designated	O
with	O
the	O
attribute	O
on	O
,	O
,	O
or	O
elements	O
.	O
</s>
<s>
Example	O
uses	O
include	O
the	O
standard	O
way	O
of	O
referencing	O
CSS	B-Language
,	O
,	O
which	O
indicates	O
that	O
the	O
external	O
resource	O
linked	O
to	O
with	O
the	O
attribute	O
is	O
a	O
stylesheet	O
,	O
so	O
a	O
web	B-Application
browser	I-Application
will	O
generally	O
fetch	O
this	O
file	O
to	O
render	O
the	O
page	O
.	O
</s>
<s>
Link	B-General_Concept
relations	I-General_Concept
are	O
used	O
in	O
some	O
microformats	B-General_Concept
(	O
e.g.	O
</s>
<s>
for	O
tagging	B-General_Concept
)	O
,	O
in	O
XHTML	B-General_Concept
Friends	I-General_Concept
Network	I-General_Concept
(	O
XFN	O
)	O
,	O
and	O
in	O
the	O
Atom	B-Application
standard	I-Application
,	O
in	O
XLink	O
,	O
as	O
well	O
as	O
in	O
HTML	B-Language
.	O
</s>
<s>
Standardized	O
link	B-General_Concept
relations	I-General_Concept
are	O
one	O
of	O
the	O
foundations	O
of	O
HATEOAS	B-Operating_System
as	O
they	O
allow	O
the	O
user	O
agent	O
to	O
understand	O
the	O
meaning	O
of	O
the	O
available	O
state	O
transitions	O
in	O
a	O
REST	B-Protocol
system	O
.	O
</s>
<s>
The	O
Internet	O
Engineering	O
Task	O
Force	O
(	O
IETF	O
)	O
has	O
a	O
registry	O
of	O
standardized	O
link	B-General_Concept
relations	I-General_Concept
,	O
and	O
a	O
procedure	O
for	O
extending	O
it	O
defined	O
in	O
RFC	O
5988	O
.	O
</s>
<s>
HTML5	B-Application
also	O
defines	O
valid	O
link	B-General_Concept
relations	I-General_Concept
.	O
</s>
<s>
The	O
attribute	O
is	O
removed	O
in	O
HTML5	B-Application
.	O
</s>
<s>
The	O
RDF	O
typed	B-General_Concept
links	I-General_Concept
are	O
fundamental	O
in	O
LOD	O
datasets	O
for	O
identifying	O
the	O
relationship	O
(	O
predicate	O
)	O
type	O
of	O
RDF	O
triples	O
,	O
contributing	O
to	O
the	O
automatic	O
processability	O
of	O
machine-readable	O
statements	O
of	O
the	O
Giant	O
Global	O
Graph	O
on	O
the	O
Semantic	O
Web	O
.	O
</s>
