diff -r d7bda914d120 -r c7f3fe4abdb2 dav/optparser.c
--- a/dav/optparser.c	Sun Dec 03 10:17:15 2017 +0100
+++ b/dav/optparser.c	Sun Dec 03 13:09:14 2017 +0100
@@ -123,6 +123,10 @@
                         ucx_map_cstr_put(a->options, "extended", NOARG);
                         break;
                     }
+                    case 'x': {
+                        ucx_map_cstr_put(a->options, "xml", NOARG);
+                        break;
+                    }
                     case 'S': {
                         // undocumented hidden feature
                         ucx_map_cstr_put(a->options, "structure", NOARG);