Research Article

A Relation Routing Scheme for Distributed Semantic Media Query

Table 3

Comparison of distributed media query schemes.

Scheme Distributed database Structural P2P network Unstructured P2P network Web search engine RRS

Query description Structural query language (e.g. SQL) Set(s) of flat identifiers (e.g. DHT) No limited the forms Keywords plus Boolean operations Prefix + semantic constraints
Query model To query global view To match structural mapping between identifier and location Flooding, random walk, supernode routing, and so forth To query the centrical indexes Prefix-based routing
Adaptable to dynamic sources Poor Good Very good Poor Very good
The optimality of transmission path Poor Poor Poor Poor Very good
Acquisition directivity Good Very good Poor Very good Very good
Search capability Stronger Weak Rely on the matching capability of forwarding nodes Normal Stronger