find
<data-source-1> from
<data-source-1> where
NL predicate on data source-1 return
<object-r> in <data-source-r>
from
<data-source-1> / <object-name> / <interface>
where
<NL filter>
return
text / table / interface
?
metadata from <data-source-1> / <object-name> / <interface>