libxml2

GNOME XML library for parsing and manipulating XML documents

brewmacoslinux

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GNOME XML library

xml2-configxmllintxmlcatalog

Validate and format an XML file$ xmllint --format document.xml

Check XML file validity against a schema$ xmllint --schema schema.xsd document.xml

Extract XPath elements from an XML file$ xmllint --xpath '//element[@attr="value"]' document.xml