Semantic P2P networks is a new type of P2P networks. It combines the advantages of unstructured P2P networks and structural P2P networks, and avoids the disadvantages of theirs.

In Semantic P2P networks, nodes

Node (networking)

In communication networks, a node is a connection point, either a redistribution point or a communication endpoint . The definition of a node depends on the network and protocol layer referred to...

 are classified as DNS

Domain name system

The Domain Name System is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities...

-like domain name

Domain name

A domain name is an identification string that defines a realm of administrative autonomy, authority, or control in the Internet. Domain names are formed by the rules and procedures of the Domain Name System ....

s with semantic meanings such as Alice @Brittney.popular.music. Semantic P2P networks contains prerequisite virtual tree topology

Topology

Topology is a major area of mathematics concerned with properties that are preserved under continuous deformations of objects, such as deformations that involve stretching, but no tearing or gluing...

 and net-like topology formed by cached nodes. Semantic P2P networks keep the semantic meanings of nodes and their contents. The nodes within semantic P2P networks can communicate each other by various languages. Semantic P2P network can execute complicated queries by SQL

SQL

SQL is a programming language designed for managing data in relational database management systems ....

-like language.