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Thank you for the feedback. The SPARQL working group intends to keep this feature.

We would be grateful if you would acknowledge that your comment has been answered by sending a reply to this mailing list.

On behalf of the SPARQL WG

> Regarding this at-risk feature: 
>     Allow certain character escape sequences in the local 
>     part of prefixed names. Thesa are the non-alphanumeric
>     characters allowed in an IRI path. The characters are
>     ~.-!$&'()*+,;=:/?#@%_.
> I am somewhat in favor of this change, though I am open
> to being convinced differently.  On the minus side, it adds
> the same functionality as percent encoding, but percent 
> encoding is more uniform, because that is the format that is
> already produced by the SPARQL Function ENCODE_FOR_URI.  So for
> machine-generation of local names, it seems inferior to percent
> encoding.  But on the plus side, it provides a convenience
> for human reading and writing of certain local names.