The document discusses requirements and approaches for RDF stream processing (RSP). It covers the following key points in 3 sentences: RSP aims to process continuous RDF streams to address scenarios like sensor data and social media. It involves querying streaming data, integrating streams with static data, and handling issues like imperfections. The document reviews existing RSP systems and languages, actor-based approaches, and the 8 requirements for real-time stream processing including keeping data moving, generating predictable outcomes, and responding instantaneously.