/usr/share/texlive/texmf-dist/tex/generic/schemata/schemata.sty is in texlive-generic-extra 2013.20140215-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%% This is file `schemata.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% schemata.dtx (with options: `package')
%%
%% This is a generated file.
%%
%% Copyright (C) 2013 by Charles P. Schaum <charles dot schaum at comcast dot net>
%%
%% This file may be distributed and/or modified under the conditions of
%% the LaTeX Project Public License, either version 1.2 of this license
%% or (at your option) any later version. The latest version of this
%% license is in:
%%
%% http://www.latex-project.org/lppl.txt
%%
%% and version 1.2 or later is part of all distributions of LaTeX version
%% 1999/12/01 or later.
%%
\expandafter\ifx\csname newenvironment\endcsname\relax%
\else
\NeedsTeXFormat{LaTeX2e}[2005/12/01]
\ProvidesPackage{schemata}
[2013/09/23 v0.7 generic package to aid construction of topical categories]
\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
\def\DoBraces{\let\schemaLD\lbrace \let\schemaRD\rbrace}\DoBraces%
\DoBraces%
\else
\DeclareOption{braces}{\let\schemaLD\lbrace \let\schemaRD\rbrace}
\DeclareOption{brackets}{\let\schemaLD\lbrack \let\schemaRD\rbrack}
\DeclareOption{parens}{\let\schemaLD( \let\schemaRD)}
\ExecuteOptions{braces}
\ProcessOptions\relax
\fi
\newbox\rhs%
\newbox\lhs%
\newdimen\rheight%
\newdimen\lheight%
\newif\ifschemaLC%
\newif\ifschemaSwitch%
\def\DoBraces{\let\schemaLD\lbrace \let\schemaRD\rbrace}\DoBraces%
\def\DoBrackets{\let\schemaLD\lbrack \let\schemaRD\rbrack}%
\def\DoParens{\let\schemaLD( \let\schemaRD)}%
\def\LCschema{\schemaLCtrue}%
\def\UCschema{\schemaLCfalse}%
\def\SwitchSB{\schemaSwitchtrue}%
\expandafter\ifx\csname newenvironment\endcsname\relax%
{\catcode`@=11
\gdef\schemabox{\futurelet\testchar\schemab@x}
\gdef\schemab@x{\ifx[\testchar \let\next\@schemabox%
\else \let\next\@schemab@x \fi \next}
\gdef\@schemab@x#1{\@schemabox[0pt]{#1}}
\gdef\@schemabox[#1]#2{%
\ifschemaLC\def\Adj{}%
\ifschemaSwitch\def\Adj{\strut}\fi
\else
\def\Adj{\strut}%
\ifschemaSwitch\def\Adj{}\fi
\fi
\schemaSwitchfalse%
\ifdim#1<1pt
\def\\{\egroup\hbox\bgroup\ignorespaces }%
\vbox{\hbox\bgroup\Adj\ignorespaces #2\egroup}%
\else
\def\\{\hfil\egroup\hbox to #1\bgroup\ignorespaces }%
\vbox{\hbox to #1\bgroup\Adj\ignorespaces #2\hfil\egroup}%
\fi
}}\else
\newcommand{\schemabox}[2][0pt]{%
\ifschemaLC\def\Adj{}%
\ifschemaSwitch\def\Adj{\strut}\fi
\else
\def\Adj{\strut}%
\ifschemaSwitch\def\Adj{}\fi
\fi
\schemaSwitchfalse%
\ifdim#1<1pt
\def\\{\egroup\hbox\bgroup\ignorespaces }%
\vbox{\hbox\bgroup\Adj\ignorespaces #2\egroup}%
\else
\def\\{\hfil\egroup\hbox to #1\bgroup\ignorespaces }%
\vbox{\hbox to #1\bgroup\Adj\ignorespaces #2\hfil\egroup}%
\fi
}\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
{\catcode`@=11
\gdef\schema{\futurelet\testchar\schem@}
\gdef\schem@{\ifx[\testchar \let\next\@schema%
\else \let\next\@schem@ \fi \next}
\gdef\@schem@#1#2{\@schema[open]{#1}{#2}}
\gdef\@schema[#1]#2#3{%
\def\Option{#1}\def\Open{open}%
\ifx\Option\Open
\setbox\rhs=\vbox{#3}%
\rheight=\ht\rhs%
\advance\rheight\dp\rhs%
\advance\rheight by 1.44265ex%
\hbox{$\vcenter{#2}\basiclbrace{\rheight}\vcenter{#3}$}%
\else
\setbox\lhs=\vbox{#2}%
\lheight=\ht\lhs%
\advance\lheight\dp\lhs%
\advance\lheight by 1.44265ex%
\hbox{$\vcenter{#2}\kern-0.2em\basicrbrace{\lheight}\vcenter{#3}$}%
\fi
}}\else
\newcommand{\schema}[3][open]{%
\def\Option{#1}\def\Open{open}%
\ifx\Option\Open
\setbox\rhs=\vbox{#3}%
\rheight=\ht\rhs%
\advance\rheight\dp\rhs%
\advance\rheight by 1.44265ex%
\hbox{$\vcenter{#2}\basiclbrace{\rheight}\vcenter{#3}$}%
\else
\setbox\lhs=\vbox{#2}%
\lheight=\ht\lhs%
\advance\lheight\dp\lhs%
\advance\lheight by 1.44265ex%
\hbox{$\vcenter{#2}\kern-0.2em\basicrbrace{\lheight}\vcenter{#3}$}%
\fi
}\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
{\catcode`@=11
\gdef\Schema{\futurelet\testchar\Schem@}
\gdef\Schem@{\ifx[\testchar \let\next\@Schema \else \let\next\@Schem@ \fi \next}
\gdef\@Schem@#1#2#3#4{\@Schema[open]{#1}{#2}{#3}{#4}}
\gdef\@Schema[#1]#2#3#4#5{%
\def\Option{#1}\def\Open{open}%
\ifx\Option\Open
\dimen0=#2%
\hbox{$\vcenter{\vskip1.44265\dimen0#4}\complexlbrace{#2}{#3}\vcenter{#5}$}%
\else
\dimen0=#2%
\hbox{$\vcenter{\vskip1.44265\dimen0#4}\kern-0.2em%
\complexrbrace{#2}{#3}\vcenter{#5}$}%
\fi
}}\else
\newcommand{\Schema}[5][open]{%
\def\Option{#1}\def\Open{open}%
\ifx\Option\Open
\dimen0=#2%
\hbox{$\vcenter{\vskip1.44265\dimen0#4}\complexlbrace{#2}{#3}\vcenter{#5}$}%
\else
\dimen0=#2%
\hbox{$\vcenter{\vskip1.44265\dimen0#4}\kern-0.2em%
\complexrbrace{#2}{#3}\vcenter{#5}$}%
\fi
}\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
\def\basiclbrace#1{%
\ifmmode\left.\vcenter{\vbox to #1{\vfil}}\right\schemaLD\fi}
\else
\newcommand{\basiclbrace}[1]{%
\ifmmode\left.\vcenter{\vbox to #1{\vfil}}\right\schemaLD\fi}
\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
\def\basicrbrace#1{%
\ifmmode\left\schemaRD\vcenter{\vbox to #1{\vfil}}\right.\fi}
\else
\newcommand{\basicrbrace}[1]{%
\ifmmode\left\schemaRD\vcenter{\vbox to #1{\vfil}}\right.\fi}
\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
\def\complexlbrace#1#2{%
\dimen0=#1%
\dimen2=#2%
\ifdim\dimen0<0pt
\ifmmode\vcenter{\hbox{$\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaLD%
\atop\vbox to -1.44265\dimen0{\vfil}$}}\fi
\else
\ifmmode\vcenter{\hbox{$\vbox to 1.44265\dimen0{\vfil}%
\atop\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaLD$}}\fi
\fi
}\else
\newcommand{\complexlbrace}[2]{%
\dimen0=#1%
\dimen2=#2%
\ifdim\dimen0<0pt
\ifmmode\vcenter{\hbox{$\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaLD%
\atop\vbox to -1.44265\dimen0{\vfil}$}}\fi
\else
\ifmmode\vcenter{\hbox{$\vbox to 1.44265\dimen0{\vfil}%
\atop\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaLD$}}\fi
\fi
}\fi
\expandafter\ifx\csname newenvironment\endcsname\relax%
\def\complexrbrace#1#2{%
\dimen0=#1%
\dimen2=#2%
\ifdim\dimen0<0pt
\ifmmode\vcenter{\hbox{$\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaRD%
\atop\vbox to -1.44265\dimen0{\vfil}$}}\fi
\else
\ifmmode\vcenter{\hbox{$\vbox to 1.44265\dimen0{\vfil}%
\atop\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaRD$}}\fi
\fi
}\else
\newcommand{\complexrbrace}[2]{%
\dimen0=#1%
\dimen2=#2%
\ifdim\dimen0<0pt
\ifmmode\vcenter{\hbox{$\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaRD%
\atop\vbox to -1.44265\dimen0{\vfil}$}}\fi
\else
\ifmmode\vcenter{\hbox{$\vbox to 1.44265\dimen0{\vfil}%
\atop\left.\vbox to 1.44265\dimen2{\vfil}\right\schemaRD$}}\fi
\fi
}\fi
\endinput
%%
%% End of file `schemata.sty'.
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