9. The method of claim 8 wherein specifying positioning of other contextual information comprises: specifying a directory path associated with a product page in a directory hierarchy, identified by a specified delimiter.
8. The method of claim 7 wherein defining the grammar comprises: specifying construction of a breadcrumb query including positioning of a user entered search string via a specified delimiter; specifying positioning in the breadcrumb query of other contextual information; and specifying construction of hints, if any are available, and delimited breadcrumb representations for the hints.