DTD stands for Document Type Definition. A DTD defines the structure and the legal elements and attributes of an XML document. A "Valid" XML document is "Well Formed", as well as it conforms to the ...

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE suppressions PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.2//EN" "https://checkstyle.org/dtds/configuration ...