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How to check empty string in an XML tag?

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# 1  
Old 03-07-2014
How to check empty string in an XML tag?
I have an XML tag <abc> which is empty as <abc></abc>.If the the tag is empty I want to flag the file as bad.

Please help.

Thanks
# 2  
Old 03-07-2014
Code:
awk '/<abc><\/abc>/{ print "file is bad";exit}' file.xml

# 3  
Old 03-07-2014
Untested, but should also work:
Code:
#!/bin/ksh
file=${1:-file.xml}
if grep -F '<abc></abc>' "$file"
then    printf '%s is bad.\n" "$file"
        exit 1
fi
exit 0

# 4  
Old 03-11-2014
Try something like :

Code:
$ awk -F'[<>]' '!$3 || $3!~/[[:alnum:]]/{print $0,"<-- empty"}'  <<test 
<abc></abc>
<cde>something</cde>
<def>   </def>
<fge> testeer<fge>
test

<abc></abc> <-- empty
<def>   </def> <-- empty

---------- Post updated at 08:16 PM ---------- Previous update was at 08:11 PM ----------

OR

Code:
$ awk '/<.*>([[:space:]]+|)<\/.*>/{ print $0, "<-- empty"}'  <<test 
<abc></abc>
<cde>something</cde>
<def>   </def>
<fge> testeer<fge>
test

<abc></abc> <-- empty
<def>   </def> <-- empty

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