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CHAPTER 2: XML Diagrams Property Description Comment Descriptive label of the instruction. Stereotype Extends the semantics of the object. You can enter a stereotype directly in this field, or add stereotypes to the list by specifying them in an extension file. Items Tab The Items tab, which is available for redefines only, lists the items to be redefined. The following tools are available: Tool Description Add Group - Adds a group of elements to be redefined. Add Attribute Group - Adds a group of attributes to be redefined. Add Simple Type - Adds a simple type to be redefined. Add Complex Type - Adds a complex type to be redefined. Business Rules (XSM) A business rule is a rule that your business follows. It is a written statement specifying what an information system must do or how it must be structured. It could be a government-imposed law, a customer requirement, or an internal guideline. You can attach business rules to your model objects to guide and document the creation of your model. For example, the rule "an employee belongs to only one division" can help you graphically build the link between an employee and a division. For more information, see Core Features Guide > Modeling with PowerDesigner > Objects > Business Rules. XML Modeling 63