\documentclass{minimal}
\usepackage{logreq}

% basic examples

% shorthand for simple "rerun latex" requests
% (for any package which requires another latex run)

\ltxrequest{sample}{1}{}

% typical bibtex request
% (e.g., if natbib.sty were to support logreq)

% sample code:

% ...
% \usepackage{natbib}
% \begin{document}
% ...
% \bibliographystyle{plainnat}
% \bibliography{bibfile1,bibfile2,bibfile3}
% \end{document}

% workflow:

% latex file	(-> both requests active)
% bibtex file
% latex file	(-> latex request active, bibtex request inactive)
% latex file	(-> both requests inactive)

\logrequest[package=natbib,priority=5,active=1]{
  \generic{bibtex}
  \cmdline{
    \binary{bibtex}
    \infile{\jobname}
  }
  \provides[type=dynamic]{
    \file{\jobname.bbl}
  }
  \requires[type=dynamic]{
    \file{\jobname.aux}
  }
  \requires[type=editable]{
    \file{bibfile1.bib}
    \file{bibfile2.bib}
    \file{bibfile3.bib}
  }
  \requires[type=static]{
    \file{plainnat.bst}
  }
}

\ltxrequest{natbib}{1}{
  \provides[type=dynamic]{
    \file{\jobname.aux}
  }
  \requires[type=dynamic]{
    \file{\jobname.bbl}
  }
}

\begin{document}
\end{document}