[regext] Re: [IANA #1410981] expert review for draft-ietf-regext-epp-eai (xml-registry)

[Tim Bray <[e-mail]>]

On Jan 20, 2025 at 7:41:11 AM, "Hollenbeck, Scott" <[e-mail]>
wrote:

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> *From:* Tim Bray <[e-mail]>
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Thank you for the review.  In your note, is the concern that the namespace
> prefix is being used for the element name (e.g., “addlEmail”)?  I found
> similar definitions in the following EPP RFCs, which are broadly
> implemented:
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> ·         EPP RFC 5730 with xmlns:epp="urn:ietf:params:xml:ns:epp-1.0"
> and <element name="epp" type="epp:eppType"/>.
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> No, the element name is fine, it’s the value of the “type” attribute that
> is troublesome.  The namespace prefix “epp" is really only designed to
> prefix element & attribute names, not to be used inside the element content
> or the attribute value.  There aren’t any standards (afaik) that require a
> standard off-the-shelf XML processor to make those prefix/URI mappings
> available.
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> For example, would you expect this to work?
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> <something xmlns:foo="urn:ietf:params:xml:ns:epp-1.0”><element name="epp"
> type=“foo:eppType”/>
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> I mean, it’s probably OK, enough people do this that most XML software can
> handle it. It’s just that as the designated XML pedant, I feel I should
> point out departures from the letter of the standard.
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> *[SAH] Tim, do you have a suggested solution? Would ‘type="emailType"’
> work? Sorry, I don’t have a parser handy to check.*
>

Unfortunately I don’t understand this application well enough to know what
you’re trying to accomplish.  In the attribute

 type=“epp:eppType”

what function is the “epp:” prefix serving? What meaning does it have?
Would epp:Type=“emailType” work as well?  Because that’s what namespace
prefixes are designed for. -T