gml:Bezier 

Bezier curves are polynomial splines that use Bezier or Bernstein polynomials for interpolation purposes. It is a special case of the B-Spline curve with two knots.
degree shall be the degree of the polynomial used for interpolation in this spline.
knot shall be the sequence of distinct knots used to define the spline basis functions.
interpolation is fixed as "polynomialSpline".
isPolynomial is fixed as "true".
knotType is not relevant for Bezier curve segments.

Element Information

Model

(gml:pos | gml:pointProperty | gml:pointRep | gml:posList | gml:coordinates) , gml:degree , gml:knot{2,2}
Children: gml:coordinates, gml:degree, gml:knot, gml:pointProperty, gml:pointRep, gml:pos, gml:posList

Attributes

QName Type Fixed Default Use Inheritable Annotation
interpolation gml:CurveInterpolationType polynomialSpline optional
isPolynomial boolean true optional
numDerivativeInterior integer 0 optional
numDerivativesAtEnd integer 0 optional
numDerivativesAtStart integer 0 optional

Source 

<element name="Bezier" type="gml:BezierType" substitutionGroup="gml:BSpline">
  <annotation>
    <documentation>Bezier curves are polynomial splines that use Bezier or Bernstein polynomials for interpolation purposes. It is a special case of the B-Spline curve with two knots. degree shall be the degree of the polynomial used for interpolation in this spline. knot shall be the sequence of distinct knots used to define the spline basis functions. interpolation is fixed as "polynomialSpline". isPolynomial is fixed as "true". knotType is not relevant for Bezier curve segments.</documentation>
  </annotation>
</element>

Sample