<s>
In	O
metadata	O
,	O
an	O
identification	B-General_Concept
scheme	I-General_Concept
is	O
used	O
to	O
identify	O
unique	O
records	O
in	O
a	O
set	O
.	O
</s>
<s>
If	O
a	O
data	O
element	O
is	O
used	O
to	O
identify	O
a	O
record	O
within	O
a	O
data	B-General_Concept
set	I-General_Concept
,	O
the	O
data	O
element	O
uses	O
the	O
Identifier	O
representation	O
term	O
.	O
</s>
<s>
An	O
identification	B-General_Concept
scheme	I-General_Concept
should	O
be	O
contrasted	O
with	O
a	O
classification	O
scheme	O
.	O
</s>
<s>
Many	O
records	O
in	O
a	O
data	B-General_Concept
set	I-General_Concept
may	O
be	O
in	O
a	O
single	O
category	O
.	O
</s>
