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perl -MXML::Parser -e '$p=XML::Parser->new(Handlers=>{Char=>sub{print +"$_[1] "}}); $p->parsefile("filename.xml")'
perl -MXML::Parser -e '$p=XML::Parser->new(Handlers=> {Char=>sub{($_=$_[1])=~tr/ \n/ /s; s/^ +$//; print}}); $p->parsefile("filename.xml"); print "\n"'