Insert all the embedded Schematron rules at the beginning of the RELAX NG schema as a child of the top-level element. Then you always know that if you have embedded rules, they will be specified together and in the same place.

Specify each Schematron rule on the element pattern that specifies the context of the embedded rule. In the previous example this means that one of the Schematron rules would be embedded on the element pattern for the item element and the other on the element pattern for the amount element in the payment section."