<s>
A	O
data	B-General_Concept
island	I-General_Concept
is	O
a	O
data	B-General_Concept
store	I-General_Concept
,	O
such	O
as	O
on	O
a	O
PDA	B-Application
or	O
other	O
computing	O
device	O
,	O
that	O
has	O
non-existent	O
or	O
limited	O
external	O
connectivity	O
.	O
</s>
<s>
Data	B-General_Concept
islands	I-General_Concept
,	O
in	O
general	O
,	O
contain	O
a	O
very	O
huge	O
set	O
of	O
data	O
relative	O
to	O
its	O
small	O
physical	O
space	O
that	O
it	O
occupies	O
.	O
</s>
<s>
A	O
data	B-General_Concept
island	I-General_Concept
is	O
a	O
subset	O
of	O
entities	O
that	O
are	O
connected	O
to	O
each	O
other	O
via	O
relationships	O
,	O
but	O
that	O
are	O
independent	O
of	O
other	O
entities	O
within	O
the	O
same	O
data	B-General_Concept
store	I-General_Concept
.	O
</s>
