WSDL schemes and docs:
- Operations index
- http://www.onvif.org/onvif/ver10/tc/onvif_core_ver10.pdf
- http://www.onvif.org/ver10/device/wsdl/devicemgmt.wsdl
- http://www.onvif.org/ver10/media/wsdl/media.wsdl
- http://www.onvif.org/ver20/ptz/wsdl/ptz.wsdl
- http://www.onvif.org/Portals/0/documents/WhitePapers/ONVIF_WG-APG-Application_Programmer's_Guide.pdf