<br><font size=2 face="Arial">How complex is the metadata being contemplated?
I think that an api returning a string value for a string key should
be considered for D-VFS. A handful of metadata keys such as "Content-Type",
"Content-Length", "Content-Language", and "Content-Location",
can be quite useful. Some protocols will have this information in
headers (eg. http), other protocols can emulate most of this information
<br><font size=2 face="Arial">chas</font>