Multiple elements in DTD

[sroberts82]

Hi,
I have an XML doc i want to write a DTD for. I have element a and he can have 0 to 4 children of element b. How do i write this in a DTD?

I know ? mean (0,1), + means (1,infinity) and * means (0, infinity) is there something I am missing?
Thanks,
Ste

 

[tsuji]

Clumsy may it be, but that's the practice.
[tt] <!ELEMENT a (b?,b?,b?,b?)>[/tt]