\setupbackend
  [export=yes]

\settaggedmetadata
  [title=Hello World!,
   author=Hans Hagen]

\starttext

\startelement[ignore]
    \input tufte
\stopelement

\input ward

\settaggedmetadata
  [whatever=Again and Again]

\startchapter[title=test]
    \input ward
\stopchapter

\stoptext
