This second part of Simple Features Access (SFA), also called ISO 19125, defines a standard Structured Query Language (SQL) schema that supports storage, retrieval, query and update of feature collections via the SQL Call-Level Interface (SQL/CLI) (ISO/IEC 9075-3:2003).
Request For Comment (RFC)
OGC Seeks Public Comment on Candidate OGC SensorThings API Extension: WebSub Asynchronous Messaging Standard