Select the XML Entities ⇒ Reserved Characters command in the Characters submenu of the Convert menu to replace XML entities <, >, ', ", and & with the characters <, >, ', ", and & that they represent. Numeric character references that represent these 5 characters are also converted. If you select some text before using this command, only characters in the selection are replaced. Otherwise, all reserved characters in the file are replaced.
Convert menu
Convert|Characters| and  ⇒ Characters
Convert|Characters|Reserved Characters ⇒ XML Entities