not that simple...

Description

The "item:" is a unique introduction to the address. Where as "http://" is already a part of the address (url) and could also be something like "mailto","file","https" etc.

Maybe we should use the mediawiki syntax:
  [http://www.physik.uni-wuerzburg.de/~pschirus/aviation/flugzeuge/ae31x.phtml Private Homepage mit technischen Daten zum ''AE31X-Projekt'']

Seems to make sense to me.