§ 1517. Answer. The defendant may, in his answer, deny any material
allegation of the complaint controverted by him, or any knowledge or
information thereof sufficient to form a belief, or may set forth facts
constituting a defense; and thereupon he may demand judgment dismissing
the complaint. He may also set forth facts as a counterclaim for the
same cause of action; or the defendant may set forth facts showing that
he has an estate or interest in said property; and thereupon he may
demand any judgment to which he would be entitled in an action brought
by him to recover that estate or to enforce in any manner the interest
which he asserts in such property; or he may combine any two or more of
said demands.