Dear fellow zoo-package users,
I am quite intrigued by the ability to define my own custom index  
class in zoo. The example given in the zoo vignette is the (already  
built-in) yearmon class defined as:

	yearmon <- function(x) structure(floor(12*x + .0001)/12, class =  
"yearmon")

As my understanding of and practice with custom structures in R is  
rather weak, I am not entirely sure how to define my own weekly index,  
in particular, how would I add methods for human readable character  
representations and Ops and MATCH methods ?
Any example would be greatly appreciated !

Thanks in advance,

Markus
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