I've tried to check xml-file on validness with cmd.exe by using the command 'xmllint' as in the example: xmllint -schema Bookstore.xsd --noout Bookstore-XSD.xml but as a result, I saw the error:
'xmllint' is not recognized as an internal or external command, operable program or batch file.
Should I install some specific library? And if I should, where is it must be (what is the folder)?