I usually use XML::XSH2 for XML manipulation. After fixing errors in your XML and wrapping it into a root node, I was able to find the corresponding Dataentry just with the following lines: 
open 937973.xml ;
for //Data[.='bbbbbb'] ls .. ;

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In reply to Re: Match on line, read backwards to opening xml tag then forward to closing tag by choroba
in thread Match on line, read backwards to opening xml tag then forward to closing tag by shadowfox

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