The putPrecedenceRules element cannot have "xsi:nil" as an attribute.
The putPrecedenceRules element in XML instance can be substituted with other elements.
XML Instance
An operation which creates each of the given precedence rules or updates
them if they already exist.
<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..*]