The published OCX Schema

A 2D hole shape defined either by a parametric hole or a curve contour. Hole2D has the following child elements:

Child	Namespace	Type	Use	Cardinality	Choice	Description
Contour	ocx	ocx:Contour3D_T	req.	[1, 1]	True	The contour of a surface or structure part.
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.
RectangularHole	ocx	ocx:RectangularHole_T	req.	[1, 1]	True	A rectangular hole in u-v space with corner fillets of equal radii.

Hole2D 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.