<s>
XPath	B-General_Concept
3	I-General_Concept
is	O
the	O
latest	O
version	O
of	O
the	O
XML	B-Language
Path	I-Language
Language	I-Language
,	O
a	O
query	B-Language
language	I-Language
for	O
selecting	O
nodes	O
in	O
XML	B-Protocol
documents	I-Protocol
.	O
</s>
<s>
It	O
supersedes	O
XPath	B-Language
1.0	I-Language
and	O
XPath	B-General_Concept
2.0	I-General_Concept
.	O
</s>
<s>
XPath	B-General_Concept
3.0	I-General_Concept
became	O
a	O
W3C	O
Recommendation	O
on	O
8	O
April	O
2014	O
,	O
while	O
XPath	B-General_Concept
3.1	I-General_Concept
became	O
a	O
W3C	O
Recommendation	O
on	O
21	O
March	O
2017	O
.	O
</s>
<s>
Compared	O
to	O
XPath	B-General_Concept
2.0	I-General_Concept
,	O
XPath	B-General_Concept
3.0	I-General_Concept
adds	O
the	O
following	O
new	O
features	O
:	O
</s>
<s>
Anonymous	B-General_Concept
functions	I-General_Concept
can	O
be	O
created	O
in	O
an	O
expression	O
context	O
.	O
</s>
<s>
Union	O
types	O
,	O
as	O
defined	O
in	O
XML	B-Protocol
Schema	O
,	O
may	O
be	O
used	O
in	O
type	O
conversions	O
and	O
function	O
type	O
signatures	O
.	O
</s>
<s>
XML	B-Language
namespaces	I-Language
may	O
be	O
referenced	O
using	O
braced	O
URI	B-Protocol
literals	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
qualified	O
name	O
math:pi	O
may	O
be	O
expanded	O
to	O
,	O
embedding	O
the	O
namespace	O
URI	B-Protocol
inside	O
the	O
prefix	O
.	O
</s>
<s>
XPath	B-General_Concept
3.1	I-General_Concept
mainly	O
adds	O
support	O
for	O
array	O
and	O
map	O
(	O
associative	B-Application
array	I-Application
)	O
data	O
types	O
.	O
</s>
<s>
These	O
types	O
and	O
their	O
associated	O
functionality	O
are	O
intended	O
to	O
ease	O
working	O
with	O
JSON	B-General_Concept
data	O
.	O
</s>
