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The "histogram" accumulator example in section 18.2.3, which also appears in slightly modified form in test case accumulator-043, is incorrect: the map that is constructed has type map(xs:untypedAtomic, xs:integer) rather than map(xs:string, xs:integer), and the test as written therefore fails with a type error.
The example has been corrected, and a note has been added to explain the pitfall.