XMPPl

XMPPl is a proposed extension to the Extensible Messaging and Presence Protocol (XMPP) intended to enable lightweight messaging with reduced overhead for mobile and low-bandwidth environments. It seeks to preserve interoperability with standard XMPP while offering optional modules that optimize delivery, presence, and security for constrained clients.

Its architecture centers on a core XMPPl module that defines a compact set of message stanzas and presence information, together with optional modules for compression, binary data transfer, and transport negotiation. The design emphasizes backward compatibility with existing XMPP servers and allows clients to negotiate the use of XMPPl features during session setup. It can operate over standard XMPP transports such as TCP, BOSH, or WebSocket via compatible servers or bridges.

Security and privacy in XMPPl are modular; end-to-end encryption is supported through established XMPP encryption methods, with options for forward secrecy, and metadata minimization through selective disclosure. Some modules provide anonymous or masked presence to enhance user privacy in shared networks.

Development and adoption: XMPPl remains experimental and has not been standardized by the XMPP Standards Foundation. Reference implementations and several experimental forks exist, but interoperability between client and server implementations can vary, and many deployments rely on custom bridges to integrate XMPPl features with legacy XMPP setups.

Related topics include the Extensible Messaging and Presence Protocol, the XMPP Standards Foundation, and XMPP Extension Protocols (XEPs).