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→Logic
| Rule
|- valign="top"
| <code>$a + 0</code>| <code>$a</code>| Identity|- valign="top"| , <code>$a * 1</code>
| <code>$a</code>
| Identity
|}
Please note that the listed rule cannot be applied to arbitrary input. For example, <code>xs:double('NaN') * 0</code> yields <code>NaN</code> instead of <code>0</code>.
=Changelog=
Introduced with Version 9.4.
