Confusion reigns!
A bit at least, and most likely because there is something I've misunderstood completely.
I have set up my Caliber library on Dropbox, run caliber2opds and generated the link for index.html. Everything works fine with a web browser, but I was under the impression I could get moon+ to access the library directly, but I don't seem to be able to. I tried adding the link to index.html under on-line libraries but only get a message that no information about the library was found.
Can someone clear up my confusion.
Thanks.
EDIT: Not index.html, but index.xml!