====== XRefPlanes ======

A collection of Y-Z planes used as object limits. Can also be used to create a frame table definition for display purposes. The exporting application will then have to provide all grid positions.

===== Attributes =====

^ Name ^ Type ^ Use ^ Description ^
| isMainSystem | xs:boolean | optional | True if this is the main reference system definition. |
| isReversed | xs:boolean | optional | For most vessels the X reference positions are given aft to forward which is the default. Set isReversed=true if  the frame positions are given from fore to aft  (normally this is the case for naval vessels). |

===== Children =====

^ Name ^ Type ^ Cardinality ^ Description ^
| [[.:distancetoap|DistanceToAP]] | ocx:Quantity_T | [0, 1] | The offset  of  frame zero (#0) from the After Perpendicular (AP). The default is zero offset (#0 is located at AP) |
| [[.:refplane|RefPlane]] | RefPlane | [1, ∞] | A reference plane used to define unbounded planar geometry. |

^ Schema version | 3.2.0 |
^ Schema location | .\OCX_Schema.xsd |
^ Namespace | https://3docx.org/fileadmin//ocx_schema//V320//OCX_Schema.xsd |
^ Created | 2026-09-09T11:33:00Z |