ObservedValue.xsd GML conformant schema for Observed Values Adds "quality" and “observable” to a Value. SJDC 2002-12-24 Observed value has optional semantic and quality indicators. The concrete element ObservedValue is added to the gml:_Value substitution group in order that it may be used in place of the standard value types. The semantic property "axis" or "observable" may be useful in disaggregating the members of a valueCollection. Observed value has optional quality indicators. Using this component, the components of an aggregate value may have independent quality indicators. Intended to store information concerning the quality of the value. An attribute "method" allows the user to indicate what kind of quality indicator this is: absolute limits, SD, 95% confidence, qualitative code, etc. Descriptive assessment of data quality Qualitative assessment of data quality Used for error measurements requiring one quantity Used for error measurements requiring two quantities on the same scale Used for error measurements requiring multiple quantities on the same scale