xmllint crash
If I use "xmllint --noout --schema cml.xsd sample-file.xml", xmllint crash with a error message and a xmllint.exe.stackdump. I attach a screenshot of the error message and the stackdump.
Note: Doing the same with xmllint from Cygwin works!
So, you ignored the instruction to leave priority assignment to the MinGW Project Administrators; in consequence, this now goes to lowest priority.
keith 
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If I use "xmllint --noout --schema cml.xsd sample-file.xml", xmllint crash with a error message and a xmllint.exe.stackdump. I attach a screenshot of the error message and the stackdump.