The published OCX Schema

User defined or unknown bar type. UserDefinedBarSection has the following child elements:

Child	Namespace	Type	Use	Cardinality	Choice	Description
SectionInnerShape	ocx	ocx:Contour3D_T	opt.	[0, 1]	False	Optional arbitrary inner section shape for hollow sections.
SectionOuterShape	ocx	ocx:Contour3D_T	opt.	[0, 1]	False	An optional arbitrary contour representing the outer section shape. Used to display the section by extrusion of the section shape along the trace line.
SectionProperties	ocx	ocx:SectionProperties_T	req.	[1, 1]	False	Generic bar section properties.
UserDefinedParameter	ocx	ocx:UserDefinedParameter_T	opt.	[0, ∞]	False	Any number of additional user-defined parameters. The intended use and how the parameter shall be interpreted shall be included in the description.

UserDefinedBarSection has the following attributes:

Attribute	Namespace	Type	Use	Default	Fixed	Description
numberOfParameters	ocx	xs:int	optional			Number of additional user-defined parameters included in the definition.