A Relation Routing Scheme for Distributed Semantic Media Query

Table 1

Packet structures.

(a) Relation query packet

Name	Query name in the form of name_r<constraints>
Selector	Order preference, publisher filter
Scope	Response quantity, timeout, and so forth
Nonce	Time stamp or sequence number to avoid routing loops

(b) Relation response packet

Name	Same as in the relation query packet
Publisher ID	Identification of the publisher for this relational data
Validation Key	Information needed to verify the validity of relational data.
Data	A sequence of relational data results