Apostrophe in docbook document

Hi there,

  I would like to know what are people using for there apostrophe in there docbook document ? There are 4 contestants:
1 ’ (curly on UTF-8 system)
2 ’
3 '
4 ’

#3 is the fastest to type. #2 and #4 are ugly to read when editing the .xml file using text file. How about solution #1 ?

Thanks
-- 
Mathieu