FOAF and jabber/XMPP

I've been working with FOAF recently, which is an RDF schema (format) for representing personal information and connections between people and appear to have found a wrinkle in the standard.

foaf:mbox is correctly described in an implementation independent manner, allowing for email message boxes, jabber message boxes and even voicemail message boxes. Unfortunately, foaf:mbox_sha1sum, which is the protected form of foaf:mbox to hide it from unwanted messages, is specified in such a way that only email is permitted:

A foaf:mbox_sha1sum of a foaf:Person is a textual representation of the result of applying the SHA1 mathematical functional to a 'mailto:' identifier (URI) for an Internet mailbox that they stand in a foaf:mbox relationship to.

I suggest that this be changed to:

A foaf:mbox_sha1sum of a foaf:Person is a textual representation of the result of applying the SHA1 mathematical functional to a URI that they stand in a foaf:mbox relationship to. Note that the URI must be complete, including any 'mailto:' or similar prefix.

foaf:mbox could also be clarified by changing:

The foaf:mbox property is a relationship between the owner of a mailbox and a mailbox. These are typically identified using the mailto: URI scheme (see RFC 2368).

to

The foaf:mbox property is a relationship between the owner of a mailbox and a mailbox. These are typically identified using the mailto: URI scheme (see RFC 2368) or any other scheme which defines a protocol suitable for storing messages for an owner.

In an ideal world, of course, the jabber/XMPP community would get their act into gear and finish standardising already so we could make direct reference to the xmpp: URI scheme