There is a typo in the BOSS spell checking documentation (
link).
CODE
<ysearchresponse responsecode="200">
<resultset_spelling count="1" start="1" totalhits="1" deephits="1">
<result>
<suggestion>monkeys giraffes</suggestion>
</result>
</resultset_spelling>
</ysearchresponse>
The returned response is
resultset_spell, instead of
resultset_spelling 
