preamble "\\begin{theindex}
  \\def\\seename{见}
  \\def\\alsoname{又见}
  \\providecommand*\\indexgroup[1]{%
    \\indexspace
    \\item \\textbf{#1}\\nopagebreak}\n"

postamble "\n\n\\end{theindex}\n"

group_skip "\n\n  \\indexspace\n\n"

headings_flag 1
heading_prefix "  %\n  \\indexgroup{"
heading_suffix "}\n  %\n"

numhead_positive "数字"
numhead_negative "数字"
symhead_positive "符号"
symhead_negative "符号"