observation.xsd Observation schema for GML 3.1 GML is an OGC Standard. Copyright (c) 2001,2005,2010 Open Geospatial Consortium. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ . This element contains or points to a description of a sensor, instrument or procedure used for the observation This element contains or points to the specimen, region or station which is the object of the observation Synonym for target - common word used for photographs Container for an object representing the target or subject of an observation. The result of the observation: an image, external object, etc