TypedValue.xsd GML conformant schema for Typed Values Compact form for scalar values, adds an "axis" attribute for soft-typing. The value of the axis attribute should point to a description of the phenomenon which this value describes SJDC 2003-01-13 Typed values have a semantic indicator "axis" added to the value. The abstract element TypedValue is added to the gml:_Value substitution group in order that it may be used in place of the standard values. Typed values have a semantic indicator "axis" added to the value. The abstract element TypedValue is added to the gml:_Value substitution group in order that it may be used in place of the standard values.