// There's no point giving the file the URI of the pipeline document.
// This formulation is parallel to the jar scheme.
URI zipURI = URI.create("zip:" + zipFn + "!" + entry.getName());
tree.startDocument(zipURI);
tree.addStartElement(XProcConstants.c_data);
tree.addAttribute(_name,name);
tree.addAttribute(_content_type, contentType);
if (!storeText) {
tree.addAttribute(_encoding, "base64");