The v1.0 spec says the namespace for dfdl ends with a trailing slash.

This is non-standard at least inconsistent with the XML Schema namespace identifiers, whose URIs do not end with a slash.

Do we want to take an errata and be conformant with XML Schema conventions here?

I think the world is not fully consistent on this. There are online discussions about some SOAP-protocol related URIs having trailing slash.

Unfortunately, this matters because things that compare XML carefully will distinguish a namespace having a trailing slash, and not having one. The rules of comparison require detecting this difference.

...mikeb

--
Mike Beckerle | OGF DFDL WG Co-Chair 
Tel:  781-330-0412