SOS (Sensor Observation Service)
This standard, referred to as OGC-SOS, defines a Web service interface which allows querying observations, sensor metadata, as well as representations of observed features.
In April 2012, The Open Geospatial Consortium (OGC®) membership adopted the OGC Sensor Observation Service (SOS) Interface Standard Version 2.0.
Provide standard tools for managing sensor networks and data in an interoperable way.
The initial request to an SOS server is for capabilities of the server. The GetCapabilities response is the dialect considered here.
Page - Metadata Dialects