To make our work somewhat useful to the outside world it'd be nice to add
functionality to SemanticForms that allows you to say "when this field is
updated, call this URL pattern and apply the returned results to other fields."

Return format is probably JSON, with keys matching the template+field names (ie,
Item[Author]).

Possible syntax:

  {{{field|name|autofill=/example/query.php?q=<Template[field]>}}}

You could point this to any URL in the local domain; for example, an ask query.
 Alternately (in our case), you could write your own PHP proxy to another provider.