http://www.w3.org/2005/08/addressing/anonymous
http://www.opengis.net/def/serviceOperation/sos/foiRetrieval/2.0/GetFeatureOfInterestResponse
http://my.client.com/uid/msg-0010
http://www.my_namespace.org/fois/st1
50.7167 7.76667
http://www.my_namespace.org/fois/st2
51.7167 8.76667
http://www.my_namespace.org/fois/st3
52.7167 9.76667