<s>
OpenSearch	B-Application
is	O
a	O
collection	O
of	O
technologies	O
that	O
allow	O
the	O
publishing	O
of	O
search	B-Application
results	I-Application
in	O
a	O
format	O
suitable	O
for	O
syndication	O
and	O
aggregation	B-Application
.	O
</s>
<s>
Introduced	O
in	O
2005	O
,	O
it	O
is	O
a	O
way	O
for	O
websites	O
and	O
search	B-Application
engines	I-Application
to	O
publish	O
search	B-Application
results	I-Application
in	O
a	O
standard	O
and	O
accessible	O
format	O
.	O
</s>
<s>
OpenSearch	B-Application
was	O
developed	O
by	O
Amazon.com	B-Application
subsidiary	O
A9	O
and	O
the	O
first	O
version	O
,	O
OpenSearch	B-Application
1.0	O
,	O
was	O
unveiled	O
by	O
Jeff	O
Bezos	O
at	O
the	O
O'Reilly	O
Emerging	O
Technology	O
Conference	O
on	O
15	O
March	O
2005	O
.	O
</s>
<s>
Draft	O
versions	O
of	O
OpenSearch	B-Application
1.1	O
were	O
released	O
during	O
September	O
and	O
December	O
2005	O
.	O
</s>
<s>
The	O
OpenSearch	B-Application
specification	O
is	O
licensed	O
by	O
A9	O
under	O
the	O
Creative	O
Commons	O
Attribution-ShareAlike	O
2.5	O
License	O
.	O
</s>
<s>
Web	B-Application
browsers	I-Application
that	O
support	O
OpenSearch	B-Application
include	O
Safari	B-Application
,	O
Microsoft	B-Application
Edge	I-Application
,	O
Firefox	B-Application
and	O
Google	B-Application
Chrome	I-Application
.	O
</s>
<s>
Mozilla	B-Operating_System
have	O
indicated	O
that	O
they	O
will	O
deprecate	O
OpenSearch	B-Application
search	O
addons	O
in	O
favour	O
of	O
WebExtensions	O
search	O
addons	O
.	O
</s>
<s>
This	O
will	O
not	O
affect	O
the	O
ability	O
to	O
manually	O
add	O
an	O
opensearch	B-Application
engine	O
from	O
a	O
website	O
As	O
of	O
December	O
5	O
,	O
2019	O
,	O
search	B-Application
engine	I-Application
add-ons	O
for	O
Firefox	B-Application
that	O
are	O
powered	O
by	O
OpenSearch	B-Application
have	O
been	O
removed	O
from	O
Mozilla	B-Operating_System
Add-ons	O
.	O
</s>
<s>
OpenSearch	B-Application
consists	O
of	O
:	O
</s>
<s>
OpenSearch	B-Application
Description	O
files	O
:	O
XML	B-Protocol
files	O
that	O
identify	O
and	O
describe	O
a	O
search	B-Application
engine	I-Application
.	O
</s>
<s>
OpenSearch	B-Application
RSS	I-Application
(	O
in	O
OpenSearch	B-Application
1.0	O
)	O
or	O
OpenSearch	B-Application
Response	O
(	O
in	O
OpenSearch	B-Application
1.1	O
)	O
:	O
format	O
for	O
providing	O
open	B-Application
search	I-Application
results	O
.	O
</s>
<s>
OpenSearch	B-Application
Aggregators	O
:	O
Sites	O
that	O
can	O
display	O
OpenSearch	B-Application
results	O
.	O
</s>
<s>
OpenSearch	B-Application
Description	O
Documents	O
list	O
search	O
result	O
responses	O
for	O
the	O
given	O
website/tool	O
.	O
</s>
<s>
RSS	O
and	O
Atom	B-Application
are	O
the	O
only	O
ones	O
formally	O
supported	O
by	O
OpenSearch	B-Application
aggregators	O
,	O
however	O
other	O
types	O
,	O
such	O
as	O
HTML	B-Language
are	O
perfectly	O
acceptable	O
.	O
</s>
<s>
Auto-discovery	O
of	O
an	O
OpenSearch	B-Application
Description	O
Document	O
is	O
available	O
from	O
both	O
HTML	B-Language
and	O
Atom	B-Application
or	O
RSS	O
feed	O
documents	O
via	O
Link	B-General_Concept
relations	I-General_Concept
in	O
the	O
form	O
of	O
<atom:link rel="search" ... />	O
for	O
Atom	B-Application
feeds	I-Application
or	O
for	O
RSS	O
feeds	O
and	O
HTML	B-Language
documents	O
.	O
</s>
<s>
OpenSearch	B-Application
Description	O
Document	O
must	O
be	O
placed	O
on	O
a	O
web	O
server	O
of	O
the	O
same	O
domain	O
.	O
</s>
<s>
OpenSearch	B-Application
Description	O
Documents	O
must	O
be	O
served	O
with	O
the	O
application/opensearchdescription	O
+xml	O
Internet	B-Application
media	I-Application
type	I-Application
.	O
</s>
<s>
Mozilla	B-Application
Firefox	I-Application
offers	O
a	O
bookmark	O
keyword	O
feature	O
where	O
an	O
occurrence	O
of	O
in	O
the	O
bookmark	O
URI	O
gets	O
replaced	O
with	O
the	O
terms	O
typed	O
in	O
the	O
address	O
bar	O
following	O
the	O
initial	O
keyword	O
.	O
</s>
