Creating a Constraint

You create constraints on the Constraints tab of an element, using one of the following tools:

Tool

Description


Add Key Constraint - The element value must be a key within the specified scope. The scope of a key is the containing element in an instance document. A key must be unique, not null, and always present


Add Unique Constraint - The element value must be unique or null within the specified scope


Add KeyRef Constraint - The element value corresponds to those of the specified key or unique constraint

For general information about creating objects, see the Objects chapter in the Core Features Guide.

Parent topic: Constraints: Keys, Uniques, and KeyRefs (XSM)

Created October 7, 2009. Send feedback on this help topic to Sybase Technical Publications: pubs@sybase.com