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Sorting by one of many

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Hi

Challenging sort problem for me. The rows can hold one to four dates and output should be sorted by only one. date1 being primary and if that is missing date2 and so on. How can this be efficiently done?  


<root>
	<row>
		<name>A</name>
		<date2>20040101</date2>
	</row>
	<row>
		<name>C</name>
		<date3>20040103</date3>
		<date4>20040109</date4>
	</row>
	<row>
		<name>B</name>
		<date1>20040102</date1>
		<date3>20040101</date3>
	</row>
</root>


//matts

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