Object attributes are divided into four ‘access’ classes: ‘normal’, ‘protected’, ‘special’ and ‘content’.

The attributes access class definition is part of the object type description. Attributes have a default access class depending on their type, but a different class can be assigned to any attribute when defining the database structure.

The access class of an attribute is used to define the access permission and the locking on that attribute.

See also

http://tech.teradp.com/tech/html/gn4/docs/VSdoc/frlrfTeraDPGN4SchemaAttributeType.html

Defining attribute access class