Hi! I have a class called Computer, and this has a public attribute, an array of FileSystems: class Computer { FileSystem[] FileSystems ; ... ... ... } class FIleSystem { long capacity; ... ... ... } I would like to create rules on the FileSystem class capacity attribute (for example: capacity > 200000). How can I do this with adding just the Computer class to working memory?(without adding each FileSystem) Thanks Janos Ribli