Syntax-directed translation may be used to build XML file editors. The main purpose of intelligent XML editors is to provide a high-level user interface. Such interface must ensure full information on possible user actions at each point of dialogue and on appropriate XML tags. The editor can be built around a logical processor — realization of a special abstract automaton. The control table of this automaton is built using the contents of the DTD file and based on calculation of the modified Wirth—Weber ratios. This approach allows the user to create syntactically correct XML files without knowledge of DTD.