The published OCX Schema

The sweep direction and extent is defined by a general 3D sweep curve. SweepCurve has the following child elements:

Child	Namespace	Type	Use	Cardinality	Choice	Description
CircumArc3D	ocx	ocx:CircumArc3D_T	opt.	[0, ∞]	True	3D Line/Arc representation. Represents a semi-circle uniquely defined by three points in 3D space given by the start position, intermediate position and the end position..
Description	ocx	xs:string	opt.	[0, 1]	False	Contains a description of the component its parent represents. The description is stored as a string. You can use this element for whatever purposes you require. This element can be used inside many OCX XML elements but is optional.
Length	ocx	ocx:Quantity_T	opt.	[0, 1]	False	The curve length computed by the sending application. Used to verify geometry reconstruction.
Line3D	ocx	ocx:Line3D_T	opt.	[0, ∞]	True	A straight line defined by two points.
NURBS3D	ocx	ocx:NURBS3D_T	opt.	[0, ∞]	True	Non-Uniform Rational Spline Base curve definition.
PolyLine3D	ocx	ocx:PolyLine3D_T	opt.	[0, ∞]	True	A list of 3D points defining a list of linear segments. Repeat the first position at the end to form a closed contour.

SweepCurve has the following attributes:

Attribute	Namespace	Type	Use	Default	Description
is2D	ocx	xs:boolean	opt.	false	Set to True if the Curve3D is given in 2D space.
GUIDRef	ocx	Restriction of type ocx:guid	opt.		A globally unique ID referring to an entity in the authoring application. The sending application creates and holds the GUID. Used to establish a unique reference to an entity persistent between applications.
name	ocx	xs:string	opt.		An optional descriptive or display name.
id	ocx	xs:ID	req.		An identifier for an element unique within the scope of the XML file. Each id must be unique within a document. The attribute uses the standard XML 1.0 ID type as defined in the XML Schema specification. This attribute is required in many OCX XML elements and an application should generate them automatically.