<s>
JSON-LD	B-Protocol
(	O
JavaScript	B-Protocol
Object	I-Protocol
Notation	I-Protocol
for	I-Protocol
Linked	I-Protocol
Data	I-Protocol
)	O
is	O
a	O
method	O
of	O
encoding	O
linked	B-Operating_System
data	I-Operating_System
using	O
JSON	B-General_Concept
.	O
</s>
<s>
One	O
goal	O
for	O
JSON-LD	B-Protocol
was	O
to	O
require	O
as	O
little	O
effort	O
as	O
possible	O
from	O
developers	O
to	O
transform	O
their	O
existing	O
JSON	B-General_Concept
to	O
JSON-LD	B-Protocol
.	O
</s>
<s>
JSON-LD	B-Protocol
allows	O
data	O
to	O
be	O
serialized	O
in	O
a	O
way	O
that	O
is	O
similar	O
to	O
traditional	O
JSON	B-General_Concept
.	O
</s>
<s>
It	O
was	O
initially	O
developed	O
by	O
the	O
JSON	B-General_Concept
for	O
Linking	O
Data	O
Community	O
Group	O
before	O
being	O
transferred	O
to	O
the	O
RDF	O
Working	O
Group	O
for	O
review	O
,	O
improvement	O
,	O
and	O
standardization	O
,	O
and	O
is	O
currently	O
maintained	O
by	O
the	O
JSON-LD	B-Protocol
Working	O
Group	O
.	O
</s>
<s>
JSON-LD	B-Protocol
is	O
a	O
World	O
Wide	O
Web	O
Consortium	O
Recommendation	O
.	O
</s>
<s>
JSON-LD	B-Protocol
is	O
designed	O
around	O
the	O
concept	O
of	O
a	O
"	O
context	O
"	O
to	O
provide	O
additional	O
mappings	O
from	O
JSON	B-General_Concept
to	O
an	O
RDF	O
model	O
.	O
</s>
<s>
The	O
context	O
links	O
object	O
properties	O
in	O
a	O
JSON	B-General_Concept
document	O
to	O
concepts	O
in	O
an	O
ontology	O
.	O
</s>
<s>
In	O
order	O
to	O
map	O
the	O
JSON-LD	B-Protocol
syntax	O
to	O
RDF	O
,	O
JSON-LD	B-Protocol
allows	O
values	O
to	O
be	O
coerced	O
to	O
a	O
specified	O
type	O
or	O
to	O
be	O
tagged	O
with	O
a	O
language	O
.	O
</s>
<s>
A	O
context	O
can	O
be	O
embedded	O
directly	O
in	O
a	O
JSON-LD	B-Protocol
document	O
or	O
put	O
into	O
a	O
separate	O
file	O
and	O
referenced	O
from	O
different	O
documents	O
(	O
from	O
traditional	O
JSON	B-General_Concept
documents	O
via	O
an	O
HTTP	B-Protocol
Link	O
header	B-Protocol
)	O
.	O
</s>
<s>
First	O
,	O
the	O
two	O
JSON	B-General_Concept
properties	O
name	O
and	O
homepage	O
and	O
the	O
type	O
Person	O
are	O
mapped	O
to	O
concepts	O
in	O
the	O
FOAF	O
vocabulary	O
and	O
the	O
value	O
of	O
the	O
homepage	O
property	O
is	O
specified	O
to	O
be	O
of	O
the	O
type	O
@id	O
.	O
</s>
<s>
In	O
other	O
words	O
,	O
the	O
homepage	O
id	O
is	O
specified	O
to	O
be	O
an	O
IRI	B-Protocol
in	O
the	O
context	O
definition	O
.	O
</s>
<s>
Based	O
on	O
the	O
RDF	O
model	O
,	O
this	O
allows	O
the	O
person	O
described	O
in	O
the	O
document	O
to	O
be	O
unambiguously	O
identified	O
by	O
an	O
IRI	B-Protocol
.	O
</s>
<s>
The	O
encoding	O
is	O
used	O
by	O
Schema.org,	O
Google	B-Application
Knowledge	I-Application
Graph	I-Application
,	O
and	O
used	O
mostly	O
for	O
search	O
engine	O
optimization	O
activities	O
.	O
</s>
<s>
It	O
is	O
also	O
the	O
basis	O
of	O
Activity	B-Application
Streams	I-Application
,	O
a	O
format	O
for	O
"	O
the	O
exchange	O
of	O
information	O
about	O
potential	O
and	O
completed	O
activities	O
"	O
,	O
and	O
is	O
used	O
in	O
ActivityPub	B-Operating_System
,	O
the	O
federated	O
social	O
networking	O
protocol	O
.	O
</s>
<s>
Additionally	O
,	O
it	O
is	O
used	O
in	O
the	O
context	O
of	O
Internet	B-Operating_System
of	I-Operating_System
Things	I-Operating_System
(	O
IoT	B-Operating_System
)	O
,	O
where	O
a	O
Thing	O
Description	O
,	O
which	O
is	O
a	O
JSON-LD	B-Protocol
document	O
,	O
describes	O
the	O
network	O
facing	O
interfaces	O
of	O
IoT	B-Operating_System
devices	O
.	O
</s>
