<s>
Semantic	B-General_Concept
P2P	I-General_Concept
networks	I-General_Concept
are	O
a	O
new	O
type	O
of	O
P2P	O
network	O
.	O
</s>
<s>
In	O
Semantic	B-General_Concept
P2P	I-General_Concept
networks	I-General_Concept
,	O
nodes	B-Protocol
are	O
classified	O
as	O
DNS-like	O
domain	O
names	O
with	O
semantic	O
meanings	O
such	O
as	O
Alice	O
@Brittney	O
.popular.music	O
.	O
</s>
<s>
Semantic	B-General_Concept
P2P	I-General_Concept
networks	I-General_Concept
contains	O
prerequisite	O
virtual	O
tree	O
topology	B-Architecture
and	O
net-like	O
topology	B-Architecture
formed	O
by	O
cached	O
nodes	B-Protocol
.	O
</s>
<s>
Semantic	B-General_Concept
P2P	I-General_Concept
networks	I-General_Concept
keep	O
the	O
semantic	O
meanings	O
of	O
nodes	B-Protocol
and	O
their	O
contents	O
.	O
</s>
<s>
The	O
nodes	B-Protocol
within	O
semantic	B-General_Concept
P2P	I-General_Concept
networks	I-General_Concept
can	O
communicate	O
each	O
other	O
by	O
various	O
languages	O
.	O
</s>
<s>
Semantic	O
P2P	O
network	O
can	O
execute	O
complicated	O
queries	O
by	O
SQL-like	O
language	O
.	O
</s>
<s>
There	O
are	O
similarities	O
between	O
semantic	O
P2P	O
systems	O
and	O
software	B-General_Concept
agents	I-General_Concept
.	O
</s>
<s>
That	O
's	O
the	O
major	O
difference	O
between	O
software	B-General_Concept
agents	I-General_Concept
and	O
semantic	O
peers	O
.	O
</s>
