2.3 Node identity

Extraneous spaces:

- space after the open brace:
( The identity of atomic values

- space before the semicolon:
same value ; every instance of...

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2.8.3.2 array-get Accessor

dm:array-get($array as array(), $position as positiveInteger) as item()*

positiveInteger is missing the xs: prefix.  Should be

dm:array-get($array as array(), $position as xs:positiveInteger) as item()*