When creating links to Excel files it is possible to add a fragment to the URL in order to specify a specific location (e.g. a certain sheet) which should be opened when the link is followed. See, for example, this question here on SU.
I am looking for a detailed documentation just what types of fragments are possible (e.g. ranges, named ranges, ...). Google & Co didn't help much, since all the results are about linking the content of cells between different Excel sheets (which is not what I'm after).
In a link
http://somehost.com/some_excel_file.xls#fragment, what are valid values for