It's a little intimidating to get started with an XML parser, so Here is a working solution for the text you presented:

Please use it as a model to learn how to use the XML parser for your real life problem. 

$ perl -MXML::LibXML -e '
my $dom = XML::LibXML->load_xml(string => shift);
print $_->to_literal(),"\n"  for 
       $dom->findnodes("/collection/document/*/text"),;
'  "<collection><document><title><text> Hello how are you</text></titl
+e></document><document><abstract><text>I am fine</text></abstract></d
+ocument></collection>"

[download]
Output 
 Hello how are you
I am fine

[download]

             My goal ... to kill off the slow brain cells that are holding me back from synergizing my knowledge of vertically integrated mobile platforms in local cloud-based content management system datafication.

In reply to Re: extract xml data and insert new xml tag into same file by NetWallah
in thread extract xml data and insert new xml tag into same file by lakssreedhar

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