The published OCX Schema

Cylindrical surface defined by origin, axis direction, radius and height. Cylinder3D has the following child elements:

Child	Namespace	Type	Use	Cardinality	Choice	Description
Area	ocx	ocx:Quantity_T	opt.	[0, 1]	False	The surface area computed by the sending application. Used to verify geometry reconstruction by allowing the receiving application to compare the source value with the reconstructed value.
Axis	ocx	ocx:Vector3D_T	req.	[1, 1]	False	Cylinder revolution axis direction.
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.
FaceBoundaryCurve	ocx	ocx:Contour3D_T	opt.	[0, 1]	False	A collection of 3D curves making up a closed boundary. To be used whenever the surface need to be bounded.
Height	ocx	ocx:Quantity_T	req.	[1, 1]	False	Cylinder height relative to origin.
Origin	ocx	ocx:Point3D_T	req.	[1, 1]	False	Cylinder anchor position.
Radius	ocx	ocx:Quantity_T	req.	[1, 1]	False	Cylinder radius.

Cylinder3D has the following attributes:

Attribute	Namespace	Type	Use	Description
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.