\ifstyleloaded\relax
\else
\input{bookcommon.hva}
\newcommand{\@book@attr}[1]{\@secid\envclass@attr{#1}}
\@makesection
  {\part}{-2}{part}
  {\@opencell{class="center"}{}{}\@open{h1}{\@book@attr{part}}}%
  {\partname~\thepart}{\\}%
  {\@close{h1}\@closecell}
\newstyle{.part}{margin:2ex auto;text-align:center}
\@makesection
  {\chapter}{-1}{chapter}
   {\@open{h1}{\@book@attr{chapter}}}%
   {\ife\chaptername{}\else\chaptername~\fi\thechapter}{\quad}{\@close{h1}}
\@makesection
  {\section}{0}{section}
  {\@open{h2}{\@book@attr{section}}}{\thesection}{\quad}{\@close{h2}}%
\@makesection
  {\subsection}{1}{subsection}
  {\@open{h3}{\@book@attr{subsection}}}{\thesubsection}{\quad}{\@close{h3}}%
\@makesection
  {\subsubsection}{2}{subsubsection}
  {\@open{h4}{\@book@attr{subsubsection}}}{\thesubsubsection}{\quad}{\@close{h4}}%
\@makesection
  {\paragraph}{3}{paragraph}
  {\@open{h5}{\@book@attr{paragraph}}}{\theparagraph}{\quad}{\@close{h5}}%
\@makesection
  {\subparagraph}{4}{subparagraph}
  {\@open{h6}{\@book@attr{subparagraph}}}{\thesubparagraph}{\quad}{\@close{h6}}%
\newcommand{\hacha@style}{book}%
\styleloadedtrue
\fi
