<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META content="MSHTML 5.00.2614.3500" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Hello. I'm new to the Jabber dev list. I'm enjoying getting my feet wet </FONT></DIV> <DIV><FONT face=Arial size=2>in the Jabber universe. To that end, I have a question regarding some</FONT></DIV> <DIV><FONT face=Arial size=2>entries in the protocol DTD files. </FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>I've see elements that are formed similar to the following:</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2><!ELEMENT foo (( a? | b? | c?)*)></FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>What is the difference between that and the following?</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2><!ELEMENT foo (( a | b | c)*)></FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Thanks,</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>-Scott Cote</FONT></DIV> <DIV> </DIV> <DIV> </DIV></BODY></HTML>