The objective of the Sensor Observation Service (SOS) is to make sensors and sensor data archives accessible via an interoperable web based interface.
SOS implementation specification
The result of the OWS-5 has been an update of the SOS specification, which yielded in the SOS implementation specification 1.0 (OGC 06-009r6) . The SOS 2.0 specification (OGC 12-006) was developed with a lot of community feedback and experiences from real world deployments.
Both specification versions can be downloaded on the OGC website: http://www.opengeospatial.org/standards/sos.
52°North is developing a multiclient framework for integration of multiple OGC web services into one client application. The development currently focuses on the integration of sensor data from the SensorObservationService. See OX-Framework for more details!