// In order to ensure unique part name,
// idea is to use the relId, which ought to be unique
String ext = info.getMimeType().substring(info.getMimeType().indexOf("/") + 1);
BinaryPartAbstractImage imagePart =
(BinaryPartAbstractImage) ctm.newPartForContentType(
info.getMimeType(),
createImageName(opcPackage, sourcePart, proposedRelId, ext), null);
// NB: contents never populated