<Undefined> attribute value

You can assign the <undefined> value to attributes of an object. For example, this is useful if you cannot define the value yet. As a result, you can immediately see which attributes have not been assigned yet.

• So that you can switch an attribute value to <undefined>, you need a list of all attributes of the required object. For example, you see such a list when you assign or modify attributes in the Properties palette or Modify Attributes dialog box.
• Right-click an attribute name and select Set to <undefined> on the shortcut menu.
• You can also select the <undefined> status for attribute values that you define by selecting check boxes. The check boxes are filled or grayed out.
• IFC export ignores attributes of the <undefined> status.