This Recommendation describes metadata for intelligent question answering service framework [ITU-T F.746.3]. This Recommendation defines metadata and service flow for different functions to support the intelligent question answering service, which provides advanced functions to generate answers for the user's question in a natural language. The scope of this Recommendation is focused on describing metadata for natural language processing function, question analysis function, candidate answer generation function, answer inference/generation function, and input and output function. This Recommendation also describes the general information flows to describe how the metadata are used in the intelligent QA service.