Attribute types for general use

ATTRIBUTE ANY = GENERIC (type CLASS( REAL, INTEGER, LINE(D2), LINE(D3), P0INT(D2), P0INT(D3), PLACEMENT(D2), PLACEMENT(D3), DIRECTION(D2), DIRECTION(D3), ROTATION(D2), ROTATION(D3), POINT ON SURFACE, DIRECTION ON SURFACE )) 

For the predefined data types REAL and INTEGER the syntax is  

The syntax for the other forms is given in conjunction with the respective entities. 

This is a class of attribute types which indicates that data is given in elementary form or as reference to an entity of the corresponding type. All entities which can appear in this form as attributes have two syntactical representations one with a name as the first argument indicating that an entity of that type is to be created, and one without the name argument indicating that the data is to be treated as a structured attribute. 

This information does not appear explicitly on the neutral file. It is recognised from the fact that either three or two coordinates are given. 

---