Select the XML Entities -> Reserved Characters command in 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| and  -> Characters
Convert|Reserved Characters -> XML Entities