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Even some shorter :)
awk '{ORS=(/\|"[ ]*$/)?"":RS}1' file

Based on requirement:
cut -d'|' -f4-7 Inp_File | sort -u

Hi.

$ echo "<mytag> ' </mytag>" | sed "s/'/\&apos;/g"
<mytag> apos; </mytag>

I guess you could use negative lookahead to solve this. I've added some dummy (although improbable) data in the input file to test different cases -


$
$
$ cat f2
<mytag>mydata</mytag>...