Quote:
	
	
		
			
				
					Originally Posted by  dwanthny
					 
				 
				I thought that was the point of swapping a comma with a semicolon.  To make sure "Wittgenstein, Ludwig" is treated as one tag as "Wittgenstein; Ludwig". 
			
		 | 
	
	
 "Wittgenstein; Ludwig" was never at risk.
The OP wants *one* tag containing all of "biography, philosophy, Wittgenstein; Ludwig'". Calibre cannot store a tag with internal commas, so calibre changes them to semicolons. I suppose it could just as easily change them to the word THERE_WAS_A_COMMA_HERE, but I suspect that would be less useful.