Yes the 'e' is necessary. It's usefulness may be marginal in the given example, but consider the year 17000000000000, which can be written 17e12, which is not only more compact, but is more readable - you don't have to count the zeros (which is hard for me anyway).
> -----Original Message-----
> From: Discussion of the Developing Date/Time Standards
> [mailto:[log in to unmask]] On Behalf Of Saašha Metsärantala
> Sent: Friday, September 16, 2011 10:37 AM
> To: [log in to unmask]
> Subject: Re: [DATETIME] End of this phase
> > y17101e4p3
> > More accurately, value between 171000000 and 171999999 and the
> > estimate is 171010000.
> Thanks for this useful clarification!
> The "p" seems to be a VERY intresting feature! But, is there any need
> for the "e"? Why not just write
> and leave the "e" out of the EDTF specification?