<s>
The	O
Jakarta	B-Language
Standard	I-Language
Tag	I-Language
Library	I-Language
(	O
JSTL	B-Language
;	O
formerly	O
JavaServer	B-Language
Pages	I-Language
Standard	I-Language
Tag	I-Language
Library	I-Language
)	O
is	O
a	O
component	O
of	O
the	O
Java	B-Language
EE	I-Language
Web	B-Application
application	I-Application
development	I-Application
platform	O
.	O
</s>
<s>
It	O
extends	O
the	O
JSP	B-Language
specification	O
by	O
adding	O
a	O
tag	O
library	O
of	O
JSP	B-Language
tags	O
for	O
common	O
tasks	O
,	O
such	O
as	O
XML	B-Protocol
data	O
processing	O
,	O
conditional	O
execution	O
,	O
database	O
access	O
,	O
loops	O
and	O
internationalization	O
.	O
</s>
<s>
JSTL	B-Language
was	O
developed	O
under	O
the	O
Java	B-Language
Community	I-Language
Process	I-Language
(	O
JCP	O
)	O
as	O
Java	B-Language
Specification	I-Language
Request	I-Language
(	O
JSR	O
)	O
52	O
.	O
</s>
<s>
On	O
May	O
8	O
,	O
2006	O
,	O
JSTL	B-Language
1.2	O
was	O
released	O
,	O
followed	O
by	O
JSTL	B-Language
1.2.1	O
on	O
Dec	O
7	O
,	O
2011	O
.	O
</s>
<s>
JSTL	B-Language
provides	O
an	O
effective	O
way	O
to	O
embed	O
logic	O
within	O
a	O
JSP	B-Language
page	O
without	O
using	O
embedded	O
Java	B-Language
code	I-Language
directly	O
.	O
</s>
<s>
The	O
use	O
of	O
a	O
standardized	O
tag	O
set	O
,	O
rather	O
than	O
breaking	O
in	O
and	O
out	O
of	O
Java	B-Language
code	I-Language
,	O
leads	O
to	O
more	O
maintainable	O
code	O
and	O
enables	O
separation	O
of	O
concerns	O
between	O
the	O
development	O
of	O
the	O
application	B-Application
code	O
and	O
user	B-Application
interface	I-Application
.	O
</s>
<s>
There	O
are	O
a	O
total	O
of	O
six	O
JSTL	B-Language
tag	O
library	O
descriptors	O
:	O
</s>
<s>
TLVs	O
allow	O
translation-time	O
validation	O
of	O
the	O
XML	B-Protocol
view	O
of	O
a	O
JSP	B-Language
page	O
.	O
</s>
<s>
The	O
TLVs	O
provided	O
by	O
JSTL	B-Language
allow	O
tag	O
library	O
authors	O
to	O
enforce	O
restrictions	O
regarding	O
the	O
use	O
of	O
scripting	O
elements	O
and	O
permitted	O
tag	O
libraries	O
in	O
JSP	B-Language
pages	O
.	O
</s>
<s>
In	O
addition	O
to	O
JSTL	B-Language
,	O
the	O
JCP	O
has	O
the	O
following	O
JSRs	O
to	O
develop	O
standard	O
JSP	B-Language
tag	O
libraries	O
:	O
</s>
