The published OCX Schema

The vessel arrangement or capacity plan defined by its compartments. Arrangement has the following child elements:

Child	Namespace	Type	Use	Cardinality	Choice	Description
Compartment	ocx	ocx:Compartment_T	req.	[1, ∞]	True	The concept of a compartment part of the vessel arrangement representing a CLOSED volume (space) defined by enclosing surface geometry.
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.
PhysicalSpace	ocx	ocx:PhysicalSpace_T	req.	[1, ∞]	True	The concept of a physical compartment representing a closed volume (space) defined by enclosing structure panels.

Arrangement has the following attributes:

Attribute	Namespace	Type	Use	Default	Fixed	Description
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.