http://doi.acm.org/10.1145/248603.248607 db/journals/sigmod/KramerNKRLKLZ97.html Ralf Kramer Ralf Nikolai Arne Koschel Claudia Rolker Peter C. Lockemann Andree Keitel Rudolf Legat Konrad Zirm WWW-UDK: A Web-based Environmental Meta-Information System. 16-21 sigmodR/26-1/P016.pdf 1997 26 SIGMOD Record 1 db/journals/sigmod/sigmod26.html#KramerNKRLKLZ97 http://www.acm.org/sigmod/record/issues/9703/Special/kramer.ps