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是否可以找到兩個節點的差異並將該差異用作特定控件的約束條件。計算兩個節點之間的差異
<xforms:bind id="DebitRebate1"
nodeset="instance('charge-options-setup')/Pattern_Setup1/Pattern1/DebitRebate1"
type="xforms:double"
constraint=". < instance('charge-options-setup')/Pattern_Setup1/Pattern1/DebitPrice1
and instance('charge-options-setup')/Pattern_Setup1/Pattern1/DebitPrice1-. >
instance('charge-options-setup')/Locations_Patterns/Debit_Minimum_Margin"/>