Get the higher query string that defines the query, e.g. a keyword
such as 'Madonna' or a semantic query such as
'<predicate>Actor</predicate><object>Madonna</object>'.
Get the lower bound of the range query string that defines the query, e.g. a keyword
such as 'Madonna' or a semantic query such as
'<predicate>Actor</predicate><object>Madonna</object>'.
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