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0.0.1
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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE xep SYSTEM 'xep.dtd' [
<!ENTITY % ents SYSTEM 'xep.ent'>
%ents;
]>
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
<xep>
<header>
Preparation Preparation not Preperation (not "e" but "a")
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<title>JID Preparation and Validation Service</title>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<abstract>This specification defines a way for an XMPP entity to request another entity to prepare and validate a given JID.</abstract>
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&LEGALNOTICE;
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<number>0328</number>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<status>Experimental</status>
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<type>Standards Track</type>
<sig>Standards</sig>
<dependencies>
<spec>XMPP Core</spec>
<spec>XMPP IM</spec>
<spec>XEP-0030</spec>
</dependencies>
0.1
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<supersedes/>
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<supersededby/>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<shortname>jid-prep</shortname>
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<author>
<firstname>Lance</firstname>
<surname>Stout</surname>
<email>lance@lance.im</email>
<jid>lance@lance.im</jid>
</author>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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&flow;
XEP-0328: Add revision block for Nyco's typo change Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
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<revision>
<version>0.2.1</version>
<date>2019-12-16</date>
<initials>nv</initials>
<remark><p>Typographical fix.</p></remark>
</revision>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<revision>
<version>0.2</version>
<date>2019-09-09</date>
<initials>fs</initials>
<remark>
<ul>
<li>Do not return error IQ result if the string to validate is
not a valid JID. It is indistinguishable if the error is
caused by the string to check, or if some other involved JID,
like the one in the 'to' attribute, is malformed.</li>
<li>Return the normalized JID in its parts, to make it clear
which parts constitute the JID</li>
<li>Do not use text as child of an IQ child element. Using
text makes it impossible to inject further child elements as
XMPP disallows mixed content.</li>
<li>Add support for base64 encoding.</li>
<li>Always announce the jidprep identity.</li>
</ul>
</remark>
</revision>
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<revision>
<version>0.1</version>
<date>2013-05-28</date>
<initials>psa</initials>
<remark><p>Initial published version approved by the XMPP Council.</p></remark>
</revision>
0.0.2
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<revision>
<version>0.0.2</version>
<date>2013-05-21</date>
<initials>lance</initials>
<remark><p>Incorporated feedback.</p></remark>
</revision>
0.0.1
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<revision>
<version>0.0.1</version>
<date>2013-05-08</date>
<initials>lance</initials>
<remark><p>Initial version.</p></remark>
</revision>
</header>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section1 topic='Introduction' anchor='intro'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<p>To accurately compare and match JIDs, a normalization step is
required by &rfc7622;. This normalization is split into two steps
called 'Preparation' and 'Enforcement' by &rfc8264; and maybe
resource-intensive. The protocol defined herein, called "JID Prep"
can be used to ask XMPP entities to perform such a
normalization. Amongst other use-cases, this protocol can be used
for testing purposes, where a test suite checks the conformance of
an normalization implementation of, e.g., an XMPP server
implementation.</p>
<p>Furthermore, in some environments, especially ones like IoT where
devices with constraint resources are used, a client may not have
access to the various Unicode and internationalization libraries
necessary to properly normalize a JID. For those situations, this
protocol can be used by a client to ask a server to normalize a JID
on its behalf.</p>
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</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section1 topic='Discovering support' anchor='disco'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<p>If a server supports JID Prep queries, it MUST specify the
'urn:xmpp:jidprep:1' feature in its service discovery information
features as specified in &xep0030;.</p>
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<example caption='Server advertises support for JID prep queries'><![CDATA[
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<iq type="result"
to="juliet@capulet.lit/balcony"
from="capulet.lit"
id="info1">
<query xmlns="http://jabber.org/protocol/disco#info">
<identity category="component" type="jidprep" />
...
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<feature var="urn:xmpp:jidprep:1" />
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</query>
</iq>]]></example>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section1 topic='Use Cases' anchor='usecases'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<p>To request preparation and enforcement, and thus normalization
and validation, of a string to a JID, the client sends a JID Prep
request to the service. This request is an &IQ; of type 'get',
containing a &lt;jid-validate-request/&gt; element qualified by the
'urn:xmpp:jidprep:1' namespace. This element contains a
&lt;maybe-jid/&gt; child element whose textual content is the string
to normalize to and validate as JID.</p>
<example caption='JID prep request (valid JID)'><![CDATA[
<iq type='get'
from='user@example.org/resource'
to='example.org'
id='request1'>
<jid-validate-request xmlns='urn:xmpp:jidprep:1'>
<maybe-jid>Σ@example.com/resource</maybe-jid>
</jid-validate-request>
</iq>]]></example>
<p>If the given string can be enforced to a valid JID, then a
&lt;jid-validate-result/&gt; with a &lt;valid-jid/&gt; child
element is returned. This child element contains the normalized
JID parts. The valid-jid element MUST contain &lt;domainpart/&gt;
and may contain &lt;localpart/&gt; and/or &lt;resourcepart/&gt;
elements. If the JID does not contain a local- or resourcepart,
then the corresponding element is omitted. Those elements contain the
normalized, i.e., PRECIS enforced, strings of the own JID
parts.</p>
<example caption='Valid JID result'><![CDATA[
<iq type='result'
from='example.org'
to='user@example.org/resource'
id='request1'>
<jid-validate-result xmlns='urn:xmpp:jidprep:1'>
<valid-jid>
<localpart>σ</localpart>
<domainpart>example.com</domainpart>
<resourcepart>resource</resourcepart>
<valid-jid>
</jid-validate-result>
</iq>]]></example>
<p>If the service is given an invalid JID, a
&lt;jid-validate-result/&gt; IQ result response with an
&lt;invalid-jid/&gt; elmeent is returned.</p>
<example caption='JID Prep request (invalid JID)'><![CDATA[
<iq type='get'
from='user@example.org/resource'
to='example.org'
id='request2'>
<jid-validate-request xmlns='urn:xmpp:jidprep:1'>
<maybe-jid>henryⅣ@example.com</maybe-jid>
</jid-validate-request>
</iq>]]></example>
<example caption='Invalid JID result'><![CDATA[
<iq type='result'
from='example.org'
to='user@example.org/resource'
id='request2'>
<jid-validate-result xmlns='urn:xmpp:jidprep:1'>
<invalid-jid>
<reason>Invalid codepoint 'Ⅳ' in localpart.</reason>
</invalid-jid>
</jid-validate-result>
</iq>]]></example>
</section1>
<section1 topic='Optional Base64 Encoding' anchor='base64'>
<p>To be able to feed arbitrary strings into the validator, not
being limited by XML 1.0, the protocol supports an optional Base64
encoding of the string to validate. The requestor first encodes the
string to UTF-8, then encodes the UTF-8 byte-sequence using Base64
(&rfc4648; <link
url='https://tools.ietf.org/html/rfc4648#section-4'>§ 4</link>) and
places the result into an &lt;base64-maybe-jid/&gt; element. This
element is a put under the &lt;jid-validate-base64-request/&gt; IQ
child element qualified by the 'urn:xmpp:jidprep:1' namespace.</p>
<p>The IQ respones of the service are identical to the ones of the
non-Base64 case.</p>
<p>If supported, service announces 'urn:xmpp:jidprep:base64:1'
feature.</p>
<example caption='JID Prep request using Base64'><![CDATA[
<iq type='get'
from='user@example.org/resource'
to='example.org'
id='request1'>
<jid-validate-base64-request xmlns='urn:xmpp:jidprep:1'>
<base64-maybe-jid>zqNAZXhhbXBsZS5jb20vcmVzb3VyY2U=</base64-maybe-jid>
</jid-validate-base64-request>
</iq>]]></example>
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</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
2019-09-12 03:59:34 -04:00
0.0.1
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<section1 topic="Implementation Notes" anchor='impl'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<p>If a client has the ability to perform the normalization process
itself, it SHOULD NOT make use of the protocol defined herein.</p>
<p>Upon a successful response, it is RECOMMENDED that the client
caches the result, mapping the original JID to the normalized
version.</p>
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</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section1 topic='Security Considerations' anchor='security'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<p>As the process for normalizing and validating a JID can be
resource intensive, there is a possibility for denial of service
attacks. A server MAY rate limit the number of requests to prevent
such attacks. Likewise, the server MAY restrict access to the
service torequests from users that are local to the server or
otherwhise trusted.</p>
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</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section1 topic='IANA Considerations' anchor='iana'>
<p>This document requires no interaction with &IANA;.</p>
</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section2 topic='Protocol Namespaces' anchor='ns'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<p>The &REGISTRAR; includes 'urn:xmpp:jidprep:1' in its registry of protocol namespaces (see &NAMESPACES;).</p>
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<ul>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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<li>urn:xmpp:jidprep:1</li>
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</ul>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
2019-09-12 03:59:34 -04:00
0.0.1
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</section2>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
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0.0.1
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<section2 topic='Protocol Versioning' anchor='registrar-versioning'>
&NSVER;
</section2>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
2019-09-12 03:59:34 -04:00
0.0.1
2013-05-08 18:24:20 -04:00
</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
2019-09-12 03:59:34 -04:00
0.0.1
2013-05-08 18:24:20 -04:00
<section1 topic='XML Schema' anchor='schema'>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
2019-09-12 03:59:34 -04:00
<p>TODO: Add once the XEP leaves the experimental state.</p>
0.0.1
2013-05-08 18:24:20 -04:00
</section1>
XEP-0328 (jid-prep): Update to 0.2 - Do not return error IQ result if the string to validate is not a valid JID. It is indistinguishable if the error is caused by the string to check, or if some other involved JID, like the one in the 'to' attribute, is malformed. - Return the normalized JID in its parts, to make it clear which parts constitute the JID</li> - Do not use text as child of an IQ child element. Using text makes it impossible to inject further child elements as XMPP disallows mixed content. - Add support for base64 encoding. After getting a green light from Lance on collaborating with me on this, this commit also adds me to the author list.
2019-09-12 03:59:34 -04:00
0.0.1
2013-05-08 18:24:20 -04:00
</xep>
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