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| valign='top' | '''Examples'''
|– <code>map:contains($week, 2)</code> returns <code>true()</code>.<br/>– <code>map:contains($week, 9)</code> returns <code>false()</code>.<br/>– <code>map:contains(map{}, "xyz")</code> returns <code>false()</code>.<br/>– <code>map:contains(map{ "xyz":=23 }, "xyz")</code> returns <code>true()</code>.<br/>
|}