find ./ -name "*.xml" -exec xmllint --noout {} \;
find . -name "*.xml" -type f -exec xmllint --encode utf8 --output '{}' --format --noblanks '{}' \;
find . -name "*.xml" -type f -exec xmllint --noout --nowarning --schema ./modules/validation/tei_all.xsd '{}' \; 2>output.txt