The optional normalized attribute shows if the curve is normalized. A value of 1 (or true) means the curve is normalized. A value of 0 (or false) means the curve is not normalized.
Source
<xs:element name="Spline13Core" type="Spline13CoreType" substitutionGroup="Curve13Core"><xs:annotation><xs:documentation>The global Spline13Core element is the mathematical core of a 3D spline curve. The spline curve is a sequence of parametric polynomial segments.</xs:documentation></xs:annotation></xs:element>