"old town square" : phrase search
old  town : either of these words
@tags church : panoramas tagged church
@tags church !city : panoramas tagged church but not tagged city
@author jeffrey martin : panoramas by jeffrey martin
@author willy : panoramas by an author named willy
born @author jeffrey : panoramas from jeffrey that have the word born
@name willy : authors named willy
@name jeffrey martin : authors named jeffrey martin
@format spherical : spherical panoramas
@format cylindrical : cylindrical panoramas