Hull Objects, General

The hull information in the data banks is stored in two distinct object types, both implementations one level above the most basic object type. (Other applications use the same object types but may also have specialized object types of their own.)

1. The first object type is the so called CAT (Contour And Table) object. In principle all hull objects except drawings are stored in this type of object. Therefore, the CAT object may be regarded as the object for hull information even if it is used for general purposes in other applications.

   The internal structure and contents of such an object depends on the type of object that it describes. The type of object is identified by an object code (object code 1 ="data type") that is registered centrally by AVEVA Marine. The model objects of Hull are all stored in CAT objects and so is much of additional information regarding standards,

2. The second type of object used by Hull is the picture object that stores pictures (for example, model views) and drawings. This object type is used - with small variations - in all AVEVA Marine applications (and is above all the object type of Drafting). However, the model objects of Hull maps into the picture object in a way that is specific to hull information. Nevertheless, information from Hull and other applications may without problems be combined into drawings, that means, into one picture object.

   The emphasis of this document is on the Hull model data objects but a short concluding section will describe how the structure of the model objects is reflected (mapped) into the picture (drawing) objects.