I just discovered that xsltproc and fop are able to process this table. Here is an updated Makefile to demonstrate it:
cat > Makefile << EOF all: tabell.pdf tabell-fop.pdf tabell.xml: tabell.adoc asciidoctor -b docbook5 -d book tabell.adoc tabell.pdf: tabell.xml dblatex tabell.xml tabell-fop.fo: tabell.xml xsltproc --output tabell-fop.fo ../data/stylesheet-fo.xsl tabell.xml tabell-fop.pdf: tabell-fop.fo fop -c ../data/fop-params.xconf -fo tabell-fop.fo -pdf tabell-fop.pdf EOF -- Happy hacking Petter Reinholdtsen