I read many things about XeLaTeX and I wanted to give it a try, but I wasn't able to figure out how to make use of Type 1 fonts, in my case especially the font Lucida, which I bought from pcTeX (which don't offer OpenType, unlike TUG). In normal LaTeX it was as easy as
\usepackage{lucimatx}
I tried a solution as proposed here: Xelatex / Fontspec how to load fonts directly from diskfile (Postscript Type 1 fonts)
\setmainfont[Path=/usr/local/texlive/2012/texmf-dist/fonts/type1/bh/lucida/]{lbr.pfb}
but this produces strange errors like
** WARNING ** Obsolete four arguments of "endchar" will be used for Type 1 "seac" operator.
** ERROR ** This font using the "seac" command for accented characters...
Conclusion: Is there an easy way to use Type 1 fonts with XeLaTeX?
MWE for the solution using \setmainfont
\documentclass[11pt]{scrartcl}
\usepackage{polyglossia}
\usepackage{xunicode}
\usepackage{xltxtra}
\setmainlanguage{german}
\setmainfont[Path=/usr/local/texlive/2012/texmf-dist/fonts/type1/bh/lucida/]{lbr.pfb}
\begin{document}
Im folgendem Abschnitt wollen die Eigenschaften des Drehimpuls untersuchen,
was uns auf die \emph{Drehimpulsalgebra} führen wird. Als eine fundamentale
Eigenschaft, aus denen wir die meisten Resultate in diesem Abschnitt erzielen
werden ist, dass der Drehimpuls (angular momentum) der infinitesimale Erzeuger
der Rotation ist.
\end{document}
Best Answer
It seems that the umlaut in "führen" is causing the problem. When I change your MWE as follows, it gives me a font substitution warning but otherwise compiles just fine:
I don't know if this is a XeLaTeX bug or a problem with the Lucida Type 1 fonts.
For more info on this issue, see the following thread from the XeTeX mailing list:
http://www.mail-archive.com/xetex@tug.org/msg04433.html