sentences:  In contrast, language sensitivity in an XML editor is driven by a formal DTD schema for the given language.Although structured editors allow the viewing and manipulation of the underlying document in a structured manner, the file format in which the document is stored on disk may or may not be heavily structured and may or may not be open or standardized (e.g., plain text versus Microsoft Word documents).Structure editing has often been employed in source code editors, as source code is naturally structured by the syntax of the computer language.