<s>
The	O
Music	B-Language
Encoding	I-Language
Initiative	I-Language
(	O
MEI	O
)	O
is	O
an	O
open-source	O
effort	O
to	O
create	O
a	O
system	O
for	O
representation	O
of	O
musical	O
documents	O
in	O
a	O
machine-readable	O
structure	O
.	O
</s>
<s>
MEI	O
closely	O
mirrors	O
work	O
done	O
by	O
text	O
scholars	O
in	O
the	O
Text	B-Language
Encoding	I-Language
Initiative	I-Language
(	O
TEI	O
)	O
and	O
while	O
the	O
two	O
encoding	O
initiatives	O
are	O
not	O
formally	O
related	O
,	O
they	O
share	O
many	O
common	O
characteristics	O
and	O
development	O
practices	O
.	O
</s>
<s>
This	O
schema	O
is	O
expressed	O
in	O
an	O
XML	B-Language
schema	I-Language
Language	O
,	O
with	O
RelaxNG	B-Language
being	O
the	O
preferred	O
format	O
.	O
</s>
<s>
The	O
MEI	O
schema	O
is	O
developed	O
using	O
the	O
One-Document-Does-it-all	O
(	O
ODD	O
)	O
format	O
,	O
a	O
literate	B-Application
programming	I-Application
XML	O
format	O
developed	O
by	O
the	O
Text	B-Language
Encoding	I-Language
Initiative	I-Language
.	O
</s>
<s>
MEI	O
is	O
often	O
used	O
for	O
music	O
metadata	O
catalogs	O
,	O
critical	O
editing	O
(	O
particularly	O
of	O
early	O
music	O
)	O
,	O
and	O
OMR-based	O
data	O
collection	O
and	O
interchange	O
.	O
</s>
<s>
MEI	O
uses	O
permissive	B-License
software	I-License
licence	I-License
;	O
the	O
Educational	B-License
Community	I-License
License	I-License
,	O
Version	O
2.0	O
,	O
(	O
related	O
to	O
the	O
Apache	B-Application
license	I-Application
,	O
2.0	O
)	O
.	O
</s>
<s>
is	O
a	O
portable	O
,	O
lightweight	O
library	O
for	O
rendering	O
Music	B-Language
Encoding	I-Language
Initiative	I-Language
(	O
MEI	O
)	O
files	O
by	O
transformation	O
into	O
Scalable	B-Application
Vector	I-Application
Graphics	I-Application
format	O
,	O
released	O
under	O
the	O
LGPLv3	B-Application
license	O
.	O
</s>
