Once a GetMap request has been successfully completed the user may want further information about the features included in the map. Use the GetFeatureInfo request to get this further information from a server. A GetFeatureInfo request returns information regarding the layers in the map and the queryable attributes of each layer. This operation is optional. If GetFeatureInfo is employed, it must be issued after a GetMap request is sent, as the X/Y pixel coordinate of a point on that map is a required input of a GetFeatureInfo request. Refer to the Web Mapping Service OGC Specification for more information about this capability (http://www.opengeospatial.org/standards/).