About
Precedence rules provide a way to delay the display of attributes until they offer a useful refinement of the navigation state.
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Configuration
The Configuration Web Service has two operations to create precedence rules.
<mdex:precedenceRule
key="ruleName"
triggerAttributeKey="triggerAttrName"
triggerAttributeValue="mval|sval"
targetAttributeKey="targetAttrName"
isLeafTrigger="true|false"/>