[widgets] multiple co-authors

In P&C the author element is defined as: "An author element represents  
people or an organization attributed with the creation of the widget."  
with zero or one occurrence [1]

I was wondering how the element is used to represent more than one  
person? The example used shows two names, but there can only be one  
email address, and the href and email attributes are only defined in  
terms of the singular ("the author").

I'm not saying this is necessarily incorrect, but perhaps could do  
with some explanation.

S

[1] http://dev.w3.org/2006/waf/widgets/#the-author-element