<s>
Muenchian	B-Language
grouping	I-Language
(	O
or	O
Muenchian	O
method	O
,	O
named	O
after	O
Steve	O
Muench	O
)	O
is	O
an	O
algorithm	O
for	O
grouping	O
of	O
data	O
used	O
in	O
XSL	B-Application
Transformations	I-Application
v1	I-Application
that	O
identifies	O
keys	O
in	O
the	O
results	O
and	O
then	O
queries	O
all	O
nodes	O
with	O
that	O
key	O
.	O
</s>
<s>
The	O
technique	O
is	O
not	O
necessary	O
in	O
XSLT	B-Application
2.0	I-Application
+	O
,	O
which	O
introduces	O
the	O
new	O
for-each-group	O
tag	O
.	O
</s>
<s>
The	O
method	O
took	O
advantage	O
of	O
XSLT	B-Application
's	O
ability	O
to	O
index	O
documents	O
using	O
a	O
key	O
.	O
</s>
