Finding the first non-empty node

Hello,

Is there a test for finding the position of the first tag that contains
data? The example would be as follows:

<root>
 <tag1/>
 <tag1/> 
 <tag1/>
 <tag1>This one has data</tag>
 <tag1>This one has data</tag>
 <tag1>This one has data</tag>
</root>

So I would like position 4 returned. Thank you

Joe

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