Reply To: XML as a deliverable from InDesign

IDML is a sort of XML, and it contains everything that was in the original InDesign document. Conceivably, that might be all they are looking for. But if not, I would have thought XSLT could re-shape/filter the XML to meet any reasonable requirements. The receiver of the XML file might use an XML editor to apply the XSLT, or even use InDesign to apply the XSLT during importation process; or you might apply it during the exportation process.