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<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">Hello
colleagues,<o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">Apologies for crossposting.<o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">During the
public comments period of the "Registration Data Access Protocol (RDAP)
Operational Profile for gTLD Registries and Registrars", https://www.icann.org/public-comments/rdap-profile-2015-12-03-en,
the following comment was received:<o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><i><font face="Calibri" size="3">"Section
1.4.1 of the Operational Profile is inconsistent with the guidance given in RFC
7482 regarding processing of RDAP queries containing a mixture of IDN A-labels
and U-labels. Per RFC 7482, “IDNs SHOULD NOT be represented as a mixture of
A-labels and U-labels; that is, internationalized labels in an IDN SHOULD be
either all A-labels or all U-labels”. This requirement is not only inconsistent
with RFC 7482, it is also counter to the consensus of the IETF community
regarding appropriate processing of IDN queries. "<o:p></o:p></font></i></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"><br></font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">Another comment on the same path says:</font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"><br></font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><i><font face="Calibri" size="3">"Allowing A-labels and U-labels will be particularly unworkable for right to left languages unless the RDAP server introduces arbitrary restrictions. It is important to remember that RDAP is intended for machine-to-machine communication. Since RFC 7482 is very clear on this guidance (do not mix the two) any software client that generates this sort of query is broken. With the relative youth of the RDAP standard there is unlikely to be a large install base of software clients with said broken implementation. If ICANN is aware of a software client that has incorrectly implemented the RDAP standard and is now generating queries which combine A-labels and U-labels then ICANN should take its concerns to the IETF where such challenges are considered as part of any implementation discussion. Enshrining bad practice within the Operational Profile will result in needless future changes to the technology or additional service restrictions."</font></i></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"><br></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">The comment
is related to the following section of the gTLD RDAP profile:<o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><i><font face="Calibri" size="3">"1.4.1
The RDAP server MUST support Internationalized Domain Name (IDN) RDAP lookup
queries using A-label or U-label format [RFC 5890] for domain name and name
server objects. The RDAP server MUST accept a mixture of the two (i.e. A-label
and U-label format) in the same RDAP lookup query”. <o:p></o:p></font></i></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">The purpose
of this message is to obtain feedback from this community regarding this issue. We believe that the following text from RFC 7482 is a
requirement for the RDAP client: <i>"IDNs SHOULD NOT be represented as a
mixture of A-labels and U-labels; that is, internationalized labels in an IDN
SHOULD be either all A-labels or all U-labels.".</i><o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">RFC7482
provides an example of why a server may receive a mixture of A-labels and
U-labels in the query: <i>"It is possible for an RDAP client to assemble a
query string from multiple independent data sources. Such a client might not be able to perform
conversions between A-labels and U-labels."</i><o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">RFC7482 gives two options to the server: <i>"An RDAP server that receives a
query string with a mixture of A-labels and U-labels MAY convert all the
U-labels to A-labels, perform IDNA processing, and proceed with exact-match
lookup. In such cases, the response to
be returned to the query source may not match the input from the query source. Alternatively, the server MAY refuse to process
the query".</i><o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"> </font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">We believe that the reasoning in RFC 7482 is sufficient
to require gTLD RDAP servers to accept and process a query that mixes A-labels and U-labels.<o:p></o:p></font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"><br></font></p>
<p class="MsoNormal"><font face="Calibri" size="3">Question for this community: is the behavior specified in the gTLD RDAP Profile (I.e. requiring processing of queries that mixes A-labels and U-labels) consistent with RFC 7482?<o:p></o:p></font></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0);"><br></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">Your feedback is appreciated.<o:p></o:p></font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3"><br></font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">Regards,</font></p><p class="MsoNormal" style="color: rgb(0, 0, 0);"><font face="Calibri" size="3">Gustavo</font></p>
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