The SummaryStandardDeviation global element is the standard deviation of the statistical value corresponding to the "STDDEV" StatsValuesEnumType enumeration.
<xs:element name="SummaryStandardDeviation" type="StatsMeasuredDecimalType" substitutionGroup="SummaryStatsValue"><xs:annotation><xs:documentation>The SummaryStandardDeviation global element is the standard deviation of the statistical value corresponding to the "STDDEV" StatsValuesEnumType enumeration.</xs:documentation></xs:annotation></xs:element>