about the syntax of the prefix line: trailing hash vs. slash

(I already posted this mail in the public-swd-wd@w3.org.)
 
Hallo,
  
 
I did not found any explanation on the net on this topic:
I run into some differences for the naming convention for the prefix lines,
 
 
1.       Some with a trailing hash ("#")
2.       And some with a trailing slash ("/")
 
 
 
Form http://de.wikipedia.org/wiki/Turtle_%28Syntax%29
<http://de.wikipedia.org/wiki/Turtle_%28Syntax%29>  I took these examples
 
 
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns
<http://www.w3.org/1999/02/22-rdf-syntax-ns> #> .
@prefix dc: <http://purl.org/dc/elements/1.1/
<http://purl.org/dc/elements/1.1/> > .
@prefix ex: <http://example.org/stuff/1.0/ <http://example.org/stuff/1.0/> >
.
 
 
 
3.) Is it possible to use NO TRAILING character (no slash or hash) , too?
 
 
What is the difference between 1.) and 2.) ???
Is 3.) possible, to?
 
 
 
Yours,
 
  F. Haferkorn