DirectoryIndex index.html
ErrorDocument 404 /error.html
AddType application/xhtml+xml; charset=UTF-8 html

In this example, the DirectoryIndex document comes from the directory indicated by the HTTP request URL and the ErrorDocument comes from the document root directory, due to the leading slash (/) in that directive. The Content-Type header for any .html documents will have a value of application/xhtml+xml and the documents will be encoded with UTF-8 character encoding.