i am asking this in the context of thomas weiss blog on

Source Code Enhancements - Part 5 of the Series on the New Enhancement Framework

http://scn.sap.com/people/thomas.weiss/blog/2006/05/03/source-code-enhancements--part-5-of-the-series-on-the-new-enhancement-framework

from the blog :

"Source code plug-ins are unnamed. You create a source code plug-in by assigning a (simple) enhancement implementation to an enhancement point. In turn, this means that a (simple) enhancement implementation can only be assigned once to an enhancement point. Otherwise the identity of a source-code plug-in would be blurred."

so if we can assign enhancement implementation only once to enhancement point,how can we create second source code plug-in to same enhancement point?