filelength=wc -l array.txt
for ((i=1;i<=filelength;i+=1)) do
if [ sed -n '$i /<key>.*<\/key>/p' array.txt ]
for ((j=i;j<=filelength;j+=1)); do
if [ sed -n '$i /<string>.*<\/string>/p' array.txt ] then
fi
done
fi
done