[JDEV] Jabber DTD ...

[Scott Cote]

Hello. I'm new to the Jabber dev list. I'm enjoying getting my feet wet in the Jabber universe. To that end, I have a question regarding some entries in the protocol DTD files.   I've see elements that are formed similar to the following:   <!ELEMENT foo (( a? | b? | c?)*)>   What is the difference between that and the following?   <!ELEMENT foo (( a | b | c)*)>   Thanks,   -Scott Cote