Re: [rules-users] Data Modeling for medical expert system

You can use dynamic enums in Guvnor (that create dynamic populated listboxes). See guvnor's doc chapter "1.4.2.4.8. Data enumerations (drop down list configurations)" For your case where number of items are really huge, you may consider using custom editors (again, in Guvnor), and implement a js page that contains some listbox (as many as level of classification in your hierarchy) or directly a tree to select the value. See "custom editor" and "working set" part of Guvnor's doc. If you are under Eclipse, well, Drools suggestion engine modification may be the only way.