You can specify expressions using the logical (and, or, not, ?:) and mathematic
operators (+ - * / % mod div).
+Results of TT commands are interpolated in the place of the template tags, unless
+using SET or CALL, i.e. [% SET foo = 1 %], [% GET foo.bar('quz'); %]
+
=over 4
[% template.title or default.title %]