The catch? xmllint is native to Linux/Unix. Fortunately, installing it on Windows is straightforward if you know where to look.
xmllint --noout file.xml Check against a DTD: xmllint --valid --noout file.xml How To Install Xmllint Windows
Method 3 — Build libxml2 and xmllint from source (advanced) Use this when you need custom options or the latest code. How To Install Xmllint on Windows: The Complete
xmllint --valid --noout --dtdvalid schema.dtd document.xml To understand the installation process, one must first
Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
To understand the installation process, one must first understand the nature of the tool. xmllint is part of the libxml2 toolkit, a software library developed for the GNOME project. Because it was designed primarily for Unix-like systems, it relies on a POSIX environment to function correctly. Consequently, installing it on Windows is not as simple as downloading a standalone .exe file; it requires a compatibility layer that provides the necessary Linux-like environment. While there are several methods to achieve this, including Windows Subsystem for Linux (WSL) and Git Bash, the most robust and standalone method involves using Cygwin.