Feature syntax
Forward rules, backward rules, and classification trees make use of a special notation known as feature syntax.
A feature is an expression of the form attribute IS value. You may use ARE or '=' in place of IS.
An attribute and a value may consist of any text excluding these reserved symbols: FACT, AND, '&', IF, '=', IS, ARE, THEN, CF, '}', '|', ';', '.'
Two or more features may be connected by AND or '&' to create a complex feature description.
Double quote characters can be used to escape from the syntax conventions.
Don't worry about layout. Also, upper and lower case differences do not matter. InterModeller is not case-sensitive.