What is it?
Shell command line tools for handling xml files see https://stackoverflow.com/a/91801/1497139 for other options
libxml2-utils
Installation
# linux
sudo apt-get install libxml2-utils
# macports Mac OS/X
sudo port install libxml2
usage
xmllint
links
xml-coreutils
Installation
# macports / OSX
sudo port install xml-coreutils