Protocol Documentation

Message Formats

Binary UDP

The packets in the binary UDP protocol are defined by a message template file, the format is described in Message Layout. The layout details for constructing packets based on the message layout is detailed in Packet Layout.

LLSD

The Linden Lab Structured Data system is an abstract way of representing data with some strong types. Three serialization formats are supported including binary, XML, and notation which are described in LLSD.

XML-RPC

The initial exchange with the login server uses XML-RPC.

Capabilities

The Capabilities system allows viewers to request abilities and be temporarily granted those abilities through a unique URL. The transport format is LLSD XML, and clients can either post new events to CAPS URLs or wait for events to come from the server on the event queue connection the client holds open.