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In 15.1.4.1, examples of fn:index-of(), the preamble to the last example runs: If @a is an attribute of type xs:NMTOKENS whose typed value is " red green blue ", then... What it means, of course, is that the string value of the attribute is "red green blue", and the typed value is therefore ("red", "green", "blue").
Erratum E41 has been drafted to correct the introduction to this example, and the bug is therefore being marked fixed and closed.