How to model Law system

[dialogue]

hi people,
am new to this site and I want help!

I have to model a law system (bassically the constitution) that can be used by a local government administrator. it has fields like 'principle legislation', common law, bye law, subsidiary legislation, constitution and english law. how do i model this!  some one help!

[Dermot]

Boy that is an interesting alternative!
When it comes to Common Law - Use Case could have a very different meaning ;-)

Jokes aside there are many possibilities - given the hierarchical nature of a constitution. You can use Packages for the higher order grouping - down to elements containing Constraints and Scenarios.
You might like to look at the other Profiles availabe like BPMN, Spem etc - see:
http://www.sparxsystems.com.au/resources/developers/uml_profiles.html
Or even create you own element types as profiles.
http://www.sparxsystems.com.au/EAUserGuide/importingandexportingprofil.htm
http://www.sparxsystems.com.au/EAUserGuide/umlprofiles_2.htm

One thing you can look at as a starter is to import the legal document (in RTF format) into a "Document Artifact" Element and then highlight Section Names in the document and use the context menu - UML | Create and Link new Element - to create Elements from the highlighted text.
This will create hyperlinks in the document to the newly created Elements. See: http://www.sparxsystems.com.au/EAUserGuide/create_elements_from_linked_do.htm
You can also paste the detailed text into the new Elements Element.Notes or to its Linked Document. See: http://www.sparxsystems.com.au/EAUserGuide/linking_documentation.htm
I would also suggest you look at the Requirements whitepaper for desriptions of formating the Elements under packages in a hierarchical pattern - see:
http://www.sparxsystems.com.au/resources/whitepapers/index.html

One point though - I guess a Constitution is defining the 'Requirements' & "Use Case" for a Legal Process it is not defining the process - so you might be able to stay at that higher level -  Activity diagrams and Statecharts etc are getting into defining the process.

Good Luck!