The published OCX Schema

Element describing the structure concept of a plate seam. Seam 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.
TraceLine	ocx	ocx:TraceLine_T	opt.	[0, 1]	True	The landing curve on the moulded panel surface represented by any Curve3D type.

Seam has the following attributes:

Attribute	Namespace	Type	Use	Description
GUIDRef	ocx	Restriction of type ocx:guid	req.	A globally Unique ID referring an entity in the sending application.
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.