The Vessel reference coordinate system organised as a frame table system. The authoring system must export the complete frame table definition for ALL X, Y and Z positions. The FrameTables may define several X, Y, or Z systems. As a minimum, each main system must be exported. If more than one system is exported, the authoring system must set the isMainSystem=true for the main reference system in each direction. This definition is kept for backward compatibility from schema version 2.8.6. It might change in a future schema version. FrameTables has the following child elements:
| Child | Namespace | Type | Use | Cardinality | Choice | Description |
|---|---|---|---|---|---|---|
| XRefPlanes | ocx | ocx:RefPlanes_T | req. | [1, ∞] | False | Frame table positions along X axis. Used to limit geometry and define topology. |
| YRefPlanes | ocx | ocx:RefPlanes_T | opt. | [0, ∞] | False | The definition of a reference grid in the Vessel Y-direction. The authoring application must export ALL the RefPlane positions. If more than one YRefPlanes definition is exported, the authoring application shall identify the main reference system by setting the isMainSytem=true. |
| ZRefPlanes | ocx | ocx:RefPlanes_T | opt. | [0, ∞] | False | The definition of a reference grid in the Vessel Z-direction. The authoring application must export ALL the RefPlane positions. If more than one ZRefPlanes definition is exported, the authoring application shall identify the main reference system by setting the sMainSytem=true. |