Section 34.2 Beamer LaTeX
Run this to produce a Beamer LaTeX slideshow:
xsltproc --xinclude -o path/to/output/slides.tex path/to/pretext/xsl/pretext-beamer.xsl path/to/source/slides.xml
Of course, you should then run e.g.
pdflatex slides.tex
to produce a PDF.