[CCXML]Regarding namelist attribute

Hi,
   In CCXML draft, for the namelist attribute, the description is differenct for some elments. 
For <dialogstart>, <dialogprepare>, <exit>- the description says that "A list of ONE or more white space separated variable names.."
And for other elements like <fetch>, <createccxml>, <send>, the description says "A list of ZERO or more white space separated variable names.."
Is it a typo in the CCXML draft or is it for some special handling ? 
What is the purpose of a namelist which contains no variable names?

Regards,
Sajeesh

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