& or & what should be used for & (ampersand) if we are using utf8 in xhtml document?

Question

What is the difference between this & and this & for &(ampersand)? What should be use with utf8 ?

Answer 1

http://www.xml.com/pub/a/2001/01/31/qanda.html

According to O'Reilly you should be using & in xml. UTF-8 is quite a bit different. http://www.fileformat.info/info/unicode/char/0026/index.htm