xml schema group

[lexul]

this is the dtd representation of what i need to convert in xml schema:
<!ELEMENT Atomic (CmdID, NoResp?, Meta?, (Add | Replace | Delete | Copy | Atomic | Map | Move | Sequence | Sync | Get | Exec | Alert)+)>

That is, I want to allow every element inside the paranthesis to be present no matter how many times(without this being necessary), as long as at least one of them is present at least once.

Any help will be appreciated:)

[Dököll]

this is the dtd representation of what i need to convert in xml schema:
<!ELEMENT Atomic (CmdID, NoResp?, Meta?, (Add | Replace | Delete | Copy | Atomic | Map | Move | Sequence | Sync | Get | Exec | Alert)+)>

That is, I want to allow every element inside the paranthesis to be present no matter how many times(without this being necessary), as long as at least one of them is present at least once.

Any help will be appreciated:)

I have two links for you, lexul!

XML Schema Tutorial

http://www.w3schools.com/schema/schema_intro.asp

For DTD Tutorial

http://www.w3schools.com/dtd/dtd_intro.asp