This paper presents an extended framework supported by a suitable dissemination protocol to enable ubiquitous Knowledge Bases (u-KBs) in pervasive RFID environments. A u-KB is a distributed and decentralized knowledge base where the factual knowledge (i.e., individuals) is scattered among objects disseminated within the environment, with no centralized repository and coordination. Key words: RFID, 802.11, Pervasive Computing, Semantic Web, Resource Discovery