Array
(
    [id] => 96913976
    [key] => 8k553sm84756z82227X385D17198183b
)

http://uk.shopping.yahooapis.com/V2/categorySearch?category=172201&format=Tree&shortcuts=true&features=Refinements&aid=96913976×tamp=1231348922&hash=llvuU2nJK0hGwf2PM6ehyw--

Array
(
    [format] => Tree
    [id] => 172201
    [xmlns] => urn:yahoo:prods
)