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We read: "Implementation-defined schema components MAY be included in the set of schema components that are used in evaluating an XQuery expression or XSLT instruction in the process of using an XDM instance to determine the settings serialization parameters." I suspect there is an error in "to determine the settings serialization parameters".
Removed the word 'settings': "Implementation-defined schema components MAY be included in the set of schema components that are used in evaluating an XQuery expression or XSLT instruction in the process of using an XDM instance to determine the serialization parameters."