pstricks-doi package conflict?

Question

The following does not work:

\documentclass{minimal}

\usepackage{doi}
\usepackage[pdf]{pstricks}

\begin{document}
  hello world
  \begin{pspicture}(1,1)
    \psline(0,0)(1,1)
  \end{pspicture}
\end{document}

However, loading the doi package after pstricks does:

\documentclass{minimal}

\usepackage[pdf]{pstricks}
\usepackage{doi}

\begin{document}
  hello world
  \begin{pspicture}(1,1)
    \psline(0,0)(1,1)
  \end{pspicture}
\end{document}

Why? Particularly, are there any caveats that I should be aware of? Thanks in advance.

Answer 1

doi.sty depends upon hyperref. It is generally recommended that hyperref be the last package you load because of the way it redefines various macros (in order to get hyperreferencing to work). So, this is mostly a similar case where the commands needed to get pstricks to work under pdflatex are also redefined by hyperref.

You might want to check out "Which packages should be loaded after hyperref instead of before?" for further details.

Answer 2

Use

\documentclass{minimal}
\usepackage{ifpdf}
\ifpdf\usepackage{doi}\fi
\usepackage[pdf]{pstricks}
...

Then doi is only loaded when running pdflatex.