The importPrecedenceRules element cannot have "xsi:nil" as an attribute.
The importPrecedenceRules element in XML instance can be substituted with other elements.
XML Instance
An operation which removes all existing precedence rules and adds the given ones.
<mdex:precedenceRulekey="string" This attribute is required.triggerAttributeKey="string" This attribute is required.triggerAttributeValue="string"targetAttributeKey="string" This attribute is required.isLeafTrigger="boolean" This attribute is required.></precedenceRule> [0..*]