Due to the information growth, distributed environments are offered as a feasible and scalable solution where Peerto-Peer networks have become more relevant. They bring many advantages as high flexibility for peers to join or leave the network dynamically, scalability, autonomy and high resilience against peer failures. However, the use of proprietary interfaces within the network and the requirement that peers must implement them to join makes P2P networks unable to interact with other systems and environments, isolating the network as a whole. In this paper, we report on a solution based on a proxy-based architecture and semantic mappings in order to allow the sharing of content between peers within a P2P network with content from other systems outside the network. Categories and Subject Descriptors H.3.3 [Information Systems]: Information Storage and Retrieval--Information Search and Retrieval; C.2.4 [Computer Systems Organization]: Computer-Communication Networks--Distributed Syst...