hi all,

For  example:

%%%%
\starttext

\placelist[part,chapter,section,subsection][criterium=all]

\part{first}
  \chapter{alpha}
    \section{a}
    \section{b}
      \subsection{x}
      \subsection{y}
  \chapter{beta}

\part{second}
  \chapter{gamma}
    \section{a}
    \section{b}
      \subsection{x}
      \subsection{y}
  \chapter{delta}

\stoptext
%%%%

how to get the following head structure in MkIV ?

Part 1  first

1 alpha
  1.1 a
  1.2 b
     1.2.1 x
     1.2.2 y
2 beta

Part 2  second

3 gamma
  3.1 a
  3.2 b
    3.2.1 x
    3.2.2 y
4 delta

-- 
Best regards,

Li Yanrui