An important document, published by the DMG in 1969, is the Denkschrift zur Transliteration der arabischen Schrift, which set the standard for decades and is even today still in use. A pdf of this document can be reached here.
Prof. Philip Clart, Ph.D.
Universität Leipzig, Ostasiatisches Institut
Schillerstr. 6, D-04109 Leipzig
Tel.: (0341) 9737151
E-mail: clart@uni-leipzig.de
apl. Prof. Dr. Peter Stein
Friedrich-Schiller-Universität, Theologische Fakultät
Fürstengraben 6, D-07737 Jena
Tel. (03641) 94 27 14
E-mail: peter.stein@uni-jena.de