How to add an "Attribute" using Schema Workbench?

Question

For educational reasons I would like to reproduce the following example schema from "Mondrian in Action":

But I cannot find a button for "Add Attribute"!?

I am only offered buttons for:

• add cube
• add dimension
• add dimension usage
• add hierarchy
• add named set
• add user defined function
• add calculated member
• add measure
• add level
• add property
• add calculated member property
• add virtual cube
• add virtual cube dimension
• add virtual cube measure
• add role

Why is "add attribute" missing? Or ... what is it that I am missing here?

Answer 1

"attribute" has been added to Mondrian schema at version 4 while the Schema Workbench is officially no longer maintained and stuck at Mondrian schema version 3.x.

This should be the documentation for Mondrian 4:

http://mondrian.pentaho.com/head/documentation/schema.php

And this "seems" to be an older version - maybe 3.x:

http://mondrian.pentaho.com/documentation/schema.php