moreLikeThis returns results that are similar to a result already found.
Parameters:
profile -
    Required. Specifies which profile you're working with.id -
    Required. the id of a single URL, returned from a previous function.
The moreLikeThis function may also use the <rankKnobs> structure, as
described in section 5.22.8, here.
The output of the function is described in the XML Elements in the Search Results section (5.13.3, here).