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<tbody><tr><td class="header">Final</td><td class="header">D. Hardt</td></tr>
<tr><td class="header"> </td><td class="header">J. Bufu</td></tr>
<tr><td class="header"> </td><td class="header">Sxip Identity</td></tr>
<tr><td class="header"> </td><td class="header">J. Hoyt</td></tr>
<tr><td class="header"> </td><td class="header">JanRain</td></tr>
<tr><td class="header"> </td><td class="header">December 5, 2007</td></tr>
</tbody></table></td></tr></tbody></table>
<h1><br>OpenID Attribute Exchange 1.0 - Final</h1>
<h3>Abstract</h3>
<p>
OpenID Attribute Exchange is an OpenID service extension for
exchanging identity information between endpoints. Messages for
retrieval and storage of identity information are provided.
</p><a name="toc"></a><br><hr>
<h3>Table of Contents</h3>
<p class="toc">
<a href="#anchor1">1.</a>
Terminology<br>
<a href="#anchor2">1.1.</a>
Definitions and Conventions<br>
<a href="#anchor3">2.</a>
Overview<br>
<a href="#anchor4">3.</a>
Information Model<br>
<a href="#identifier-definition">3.1.</a>
Subject Identifier<br>
<a href="#attribute-name-definition">3.2.</a>
Attribute Type Identifier<br>
<a href="#attribute-value-definition">3.3.</a>
Attribute Value<br>
<a href="#attribute-specific-encodings">3.3.1.</a>
Attribute-Specific Encodings<br>
<a href="#anchor5">4.</a>
Discovery<br>
<a href="#fetch">5.</a>
Fetch Message<br>
<a href="#fetch_request">5.1.</a>
Fetch Request Format<br>
<a href="#fetch_response">5.2.</a>
Fetch Response Format<br>
<a href="#store">6.</a>
Store Message<br>
<a href="#store_request">6.1.</a>
Store Request Format<br>
<a href="#store_response">6.2.</a>
Store Response Format<br>
<a href="#anchor6">6.2.1.</a>
Storage Success<br>
<a href="#anchor7">6.2.2.</a>
Storage Failure<br>
<a href="#anchor8">7.</a>
Security Considerations<br>
<a href="#anchor9">8.</a>
Acknowledgements<br>
<a href="#rfc.references1">9.</a>
References<br>
<a href="#rfc.references1">9.1.</a>
Normative References<br>
<a href="#rfc.references2">9.2.</a>
Non-normative References<br>
<a href="#rfc.authors">§</a>
Authors' Addresses<br>
</p>
<br clear="all">
<a name="anchor1"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.1"></a><h3>1.
Terminology</h3>
<p>
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described
in <a class="info" href="#RFC2119">[RFC2119]<span> (</span><span class="info">Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” March 1997.</span><span>)</span></a>.
</p>
<a name="anchor2"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.1.1"></a><h3>1.1.
Definitions and Conventions</h3>
<p>
</p>
<blockquote class="text"><dl>
<dt>User:</dt>
<dd>
Also referred to as "End User" or "Subject".
A person with a digital identity who participates in
OpenID-based identity information exchanges using their
client software, typically a web browser.
</dd>
<dt>Identity Data:</dt>
<dd>
A property of a digital identity in which the Property
Name and Property Value are represented as a name-value
pair.
</dd>
<dt>Attribute</dt>
<dd>
The base of the information model used to describe the
Identity Data, for the purpose of exchanging it.
</dd>
<dt>Persona:</dt>
<dd>
A subset of the user's identity data. A user can have
multiple personas as part of their identity. For example,
a user might have a work persona and a home persona.
</dd>
<dt>OpenID Provider:</dt>
<dd>
Also called "OP" or "Server". An OpenID Authentication
server on which a Relying Party relies for an assertion
that the end user controls an Identifier.
</dd>
<dt>Relying Party:</dt>
<dd>
Also called "RP" or "Consumer". A Web application that
wants proof that the end user controls an Identifier,
and requests identity data associated with the end user.
</dd>
</dl></blockquote><p>
</p>
<p>
All OpenID Attribute Exchange messages MUST contain the
following extension namespace declaration, as specified
in the Extensions section of OpenID-Authentication-2.0:
</p><div style="display: table; width: 0pt; margin-left: 3em; margin-right: auto;"><pre>
openid.ns.<extension_alias>=http://openid.net/srv/ax/1.0
</pre></div>
<p>
The actual extension namespace alias should be determined
on a per-message basis by the party composing the messages,
in such a manner as to avoid conflicts between multiple
extensions. For the purposes of this document, the extension
namespace alias for the attribute exchange service will be "ax".
</p>
<a name="anchor3"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.2"></a><h3>2.
Overview</h3>
<p>
The attribute exchange service extension is identified by the
URI "http://openid.net/srv/ax/1.0". This URI MUST be specified in the extension
namespace declaration.
</p>
<p>
An attribute is a unit of personal identity information that
is identified by a unique URI. It may refer to any kind of
information. A reference example of defining attribute types
is provided by <a class="info" href="#OpenID.axschema">[OpenID.axschema]<span> (</span><span class="info">Hardt, D., “Schema for OpenID Attribute Exchange,” May 2007.</span><span>)</span></a>.
</p>
<p>
This service extension defines two message types for
transferring attributes: fetch (see <a class="info" href="#fetch">Section 5<span> (</span><span class="info">Fetch Message</span><span>)</span></a>)
and store (see <a class="info" href="#store">Section 6<span> (</span><span class="info">Store Message</span><span>)</span></a>). Fetch retrieves
attribute information from an OpenID Provider, while store
saves or updates attribute information on the OpenID
Provider. Both messages originate from the Relying Party
and are passed to the OpenID Provider via the user agent
as per the OpenID Authentication protocol specification.
</p>
<p>
The request parameters detailed here MUST be sent using the
<a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a> extension mechanism.
</p>
<a name="anchor4"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.3"></a><h3>3.
Information Model</h3>
<p>
The OpenID Attribute Exchange service extension provides a
mechanism for moving identity information between sites, as
such its information model is simple:
</p>
<blockquote class="text">
<p>An attribute is associated with a Subject Identifier
</p>
<p>An attribute has a type identifier and a value
</p>
<p>An attribute type identifier is a URI
</p>
<p>An attribute value can be any kind of data.
</p>
</blockquote><p>
</p>
<a name="identifier-definition"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.3.1"></a><h3>3.1.
Subject Identifier</h3>
<p>
An identifier for a set of attributes. It MUST be a URI. The
subject identifier corresponds to the end-user identifier in
the authentication portion of the messages. In other words,
the subject of the identity attributes in the attribute
exchange part of the message is the same as the end-user in
the authentication part. The subject identifier is not
included in the attribute exchange.
</p>
<a name="attribute-name-definition"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.3.2"></a><h3>3.2.
Attribute Type Identifier</h3>
<p>
An attribute type identifier MUST be a URI, which is used
for referring to property values.
</p>
<p>
If an attribute type identifier URI can be resolved then it
MAY be dereferenced to retrieve a description of the
property. OpenID Providers can use the metadata obtained
through dereferencing new or unknown attribute types to
dynamically assist the user in providing the attribute.
</p>
<p>
This provides for flexibility and extensibility. Flexibility
in that both URNs and URLs can be used to refer to property
values. Extensibility allows any individual site, or
consortium of sites, to define their own attribute types
with agreements on the syntax and semantics of their
associated attribute values.
</p>
<p>
<a class="info" href="#OpenID.axschema">[OpenID.axschema]<span> (</span><span class="info">Hardt, D., “Schema for OpenID Attribute Exchange,” May 2007.</span><span>)</span></a> outlines an example method
of defining new attribute type URIs, and also provides a set
of attribute types with their associated metadata schema and
data formats.
</p>
<a name="attribute-value-definition"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.3.3"></a><h3>3.3.
Attribute Value</h3>
<p>
A attribute value MUST be a <a class="info" href="#RFC3629">UTF-8<span> (</span><span class="info">Yergeau, F., “UTF-8, a transformation format of ISO 10646,” November 2003.</span><span>)</span></a> [RFC3629]
string. In order to comply with the data formats defined by
the underlying <a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a>
protocol, attribute values MUST NOT contain newlines
(UCS codepoint 10, "\n").
</p>
<p>
OpenID Attribute Exchange can be used to transfer any kind
of data. If the data contains newlines, is not a UTF-8 string
or it is so desired by the parties transferring the data,
the data MUST be encoded to a UTF-8 string without newlines.
</p>
<a name="attribute-specific-encodings"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.3.3.1"></a><h3>3.3.1.
Attribute-Specific Encodings</h3>
<p>
Attribute-specific encodings can be defined using the
attribute metadata descriptions and may be applied by
the protocol layer above OpenID Attribute Exchange.
</p>
<p>
Optionally, attribute-specific encodings may use language
tags <a class="info" href="#OpenID.value-lang-1.0">[OpenID.value‑lang‑1.0]<span> (</span><span class="info">Wahl, M., “Language Tags for OpenID Values,” April 2007.</span><span>)</span></a> for
localization.
</p>
<a name="anchor5"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.4"></a><h3>4.
Discovery</h3>
<p>
Discovery of the attribute exchange service extension is
achieved via the mechanism described in <a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a>. The attribute exchange
namespace "http://openid.net/srv/ax/1.0" SHOULD be listed as an <xrd:Type>
child element of the <xrd:Service> element in the XRDS
discovery document.
</p>
<a name="fetch"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.5"></a><h3>5.
Fetch Message</h3>
<p>
The fetch message is used to retrieve personal identity
attributes from an OpenID Provider.
</p>
<a name="fetch_request"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.5.1"></a><h3>5.1.
Fetch Request Format</h3>
<p>
With the exception of "openid.ax.mode", all of the following
request fields are OPTIONAL, though at least one of
"openid.ax.required" or "openid.ax.if_available" MUST be
specified in the request, and any attribute alias present in a
"openid.ax.required" or "openid.ax.if_available" parameter MUST
have an associated "openid.ax.type.<alias>" parameter.
The supported length for attribute aliases MUST be at least
32 characters.
</p>
<p>
Multiple attribute aliases in the "openid.ax.required" and
"openid.ax.if_available" directives are separated with a
comma, ",".
</p>
<p>
</p>
<blockquote class="text"><dl>
<dt>openid.ax.mode</dt>
<dd>
<blockquote class="text">
<p>
REQUIRED. Value: "fetch_request".
</p>
</blockquote>
</dd>
<dt>openid.ax.type.<alias></dt>
<dd>
<blockquote class="text">
<p>
The value of this parameter specifies the type identifier
URI of a requested attribute. The <alias> will
further be used to identify the attribute being exchanged.
</p>
<p>
Attribute aliases MUST NOT contain newline and colon characters,
as specified in the Data Formats / Protocol Messages section of
<a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a>; they also MUST
NOT contain commas (",") and periods (".").
</p>
</blockquote>
</dd>
<dt>openid.ax.required</dt>
<dd>
<blockquote class="text">
<p>
Value: an attribute alias, or a list of aliases
corresponding to the URIs defined by
"openid.ax.type.<alias>" parameters. Multiple
attribute aliases are separated with a comma, ",".
</p>
<p>
By requesting attributes using this field, a hint is sent
to the OP about the RP's requirements for offering certain
functionality and should be used by the OP to help the
user decide what attributes to release. RP's requirements
should not be enforced by the OP.
</p>
<p>
The RP should offer, out of band of attribute exchange,
an alternate method of collecting the attributes it needs,
if they weren't obtained via attribute exchange.
</p>
</blockquote>
</dd>
<dt>openid.ax.if_available</dt>
<dd>
<blockquote class="text">
<p>
Value: an attribute alias, or a list of aliases
corresponding to the URIs defined by
"openid.ax.type.<alias>" parameters. Multiple
attribute aliases are separated with a comma, ",".
</p>
<p>
Attributes requested using this field are deemed
optional by the RP; the RP should be able to complete
the interaction with the user even if values are not
provided by the OP for the optional attributes.
</p>
</blockquote>
</dd>
<dt>openid.ax.count.<alias></dt>
<dd>
<blockquote class="text">
<p>
The number of values for the specified attribute
alias the Relying Party wishes to receive from the OpenID
Provider. If present, the value MUST be greater than zero,
or the special value "unlimited" which signifies that the
RP is requesting as many values as the OP has for the
attribute. If absent, exactly one value is requested.
</p>
<p>
OpenID Providers MAY return less than or the exact
number of values speficied by this field for the
associated attribute, but MUST NOT return more than
the number of requested values for the attribute.
</p>
</blockquote>
</dd>
<dt>openid.ax.update_url</dt>
<dd>
<blockquote class="text">
<p>
If present, the OpenID Provider may re-post the fetch
response message to the specified URL at some time
after the initial response has been sent, using a
OpenID Authentication Positive Assertion. If the
OpenID Provider supports this feature it MUST return
the parameter as part of the fetch response message.
If it does not support this feature it may legally
ignore this parameter.
</p>
<p>
The value of the "openid.ax.update_url" field MUST
be used as value for "openid.return_to" field of the
underlying OpenID Authentication Positive Assertion
of the fetch response update.
</p>
<p>
The "openid.ax.update_url" value MUST also match the
realm specified in the underlying OpenID message of the
fetch request, if a "openid.realm" field is present.
The matching rules are the ones specified in the
"Realms" section of the OpenID Authentication protocol.
</p>
<p>
This "unsolicited" response message would be
generated in response to an attribute information
update, and would contain the updated data. The OP
should obtain the user's consent for resending the
updated data to the RPs, as with any OpenID Positive
Assertion.
</p>
<p>
The relying party may include transaction data encoded
in the URL such that it contains enough information to
match the attribute information to the identity subject.
Additional information may be encoded in the URL by the
relying party as necessary.
</p>
<p>
If an RP wishes to receive no further updates for an
attribute, it MAY return the HTTP 404 response code to
the corresponding "update_url". OPs MAY decide to
stop sending updates after encountering 404 response
codes.
</p>
</blockquote>
</dd>
</dl></blockquote><p>
</p>
<p>
This example requests the required full name and gender
information, and the optional favourite dog and movie
information. The Relying Party is interested in up to three
favorite movies associated with the subject identifier.
</p><div style="display: table; width: 0pt; margin-left: 3em; margin-right: auto;"><pre>
openid.ns.ax=http://openid.net/srv/ax/1.0
openid.ax.mode=fetch_request
openid.ax.type.fname=http://example.com/schema/fullname
openid.ax.type.gender=http://example.com/schema/gender
openid.ax.type.fav_dog=http://example.com/schema/favourite_dog
openid.ax.type.fav_movie=http://example.com/schema/favourite_movie
openid.ax.count.fav_movie=3
openid.ax.required=fname,gender
openid.ax.if_available=fav_dog,fav_movie
openid.ax.update_url=http://idconsumer.com/update?transaction_id=a6b5c41
</pre></div>
<a name="fetch_response"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.5.2"></a><h3>5.2.
Fetch Response Format</h3>
<p>
The fetch response message supplies the information
requested in the fetch request. Each attribute is supplied
with the assigned alias prefixed by "openid.ax.value." as the
lvalue and the attribute value as the rvalue. Attribute
types are also returned in the "openid.ax.type.<alias>"
parameters. The supported length for attribute aliases MUST
be at least 32 characters.
</p>
<p>
With the exception of "openid.ax.mode", all of the following
request fields are OPTIONAL, though any attribute value
present in a "openid.ax.value.<alias>" parameter MUST
have an associated "openid.ax.type.<alias>" parameter.
</p>
<p>
If a value was not supplied or available from the user,
the associated "openid.ax.value.<alias>" field
SHOULD NOT be included by the OP in the fetch response.
An "openid.ax.count.<alias>" with a value of "0"
together with its corresponding "openid.ax.type.<alias>"
field MAY be included to explicitly state that no values
are provided for an attribute.
</p>
<p>
Validation of the received data should be performed out of band
of attribute exchange by the RP.
</p>
<p>
</p>
<blockquote class="text"><dl>
<dt>openid.ax.mode</dt>
<dd>
<blockquote class="text">
<p>
REQUIRED. Value: "fetch_response".
</p>
</blockquote>
</dd>
<dt>openid.ax.type.<alias></dt>
<dd>
<blockquote class="text">
<p>
The value of this parameter specifies the type identifier
URI for an attribute in the fetch response.
The <alias> will further be used to identify
the attribute being exchanged.
</p>
<p>
Attribute aliases MUST NOT contain newline and colon characters,
as specified in the Data Formats / Protocol Messages section of
<a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a>; they also MUST
NOT contain commas (",") and periods (".").
</p>
</blockquote>
</dd>
<dt>openid.ax.count.<alias></dt>
<dd>
<blockquote class="text">
<p>
The number of values returned for the attribute referred
to as <alias>.
</p>
</blockquote>
</dd>
<dt>openid.ax.value.<alias></dt>
<dd>
<blockquote class="text">
<p>
Assigns a value to the attribute referred to as
<alias>. This parameter format MUST be used if
"openid.ax.count.<alias>" is not sent.
</p>
</blockquote>
</dd>
<dt>openid.ax.value.<alias>.<number></dt>
<dd>
<blockquote class="text">
<p>
Assigns a value to the attribute referred to as
<alias>. This parameter format MUST be used
if "openid.ax.count.<alias>" is sent and at least
one value is provided for the associated attribute.
</p>
<p>
The <number> uniquely identifies the index of
the value, ranging from one to the value specified by
"openid.ax.count.<alias>". The number of
parameters MUST be equal to the value specified by
"openid.ax.count.<alias>". The OP is not
required to preserve the order of attribute values
among fetch responses.
</p>
</blockquote>
</dd>
<dt>openid.ax.update_url</dt>
<dd>
<blockquote class="text">
<p>
Returns the "update_url" parameter specified in the
request. If the OpenID Provider receives an
"update_url" parameter and it intends to support the
attribute update feature, it MUST present the
"update_url" parameter and value as part of the fetch
response message.
</p>
</blockquote>
</dd>
</dl></blockquote><p>
</p>
<p>
A fetch response message may also be sent to the
"update_url" specified in <a class="info" href="#fetch_request">Section 5.1<span> (</span><span class="info">Fetch Request Format</span><span>)</span></a> in response to attribute value
updates on the OpenID Provider.
</p>
<p>
The response to the previous request example, in which the
required full name information, and the optional favourite
dog information are supplied. Even though three movie names
were requested, the OP supplied only two values.
</p><div style="display: table; width: 0pt; margin-left: 3em; margin-right: auto;"><pre>
openid.ns.ax=http://openid.net/srv/ax/1.0
openid.ax.mode=fetch_response
openid.ax.type.fname=http://example.com/schema/fullname
openid.ax.type.gender=http://example.com/schema/gender
openid.ax.type.fav_dog=http://example.com/schema/favourite_dog
openid.ax.type.fav_movie=http://example.com/schema/favourite_movie
openid.ax.value.fname=John Smith
openid.ax.count.gender=0
openid.ax.value.fav_dog=Spot
openid.ax.count.fav_movie=2
openid.ax.value.fav_movie.1=Movie1
openid.ax.value.fav_movie.2=Movie2
openid.ax.update_url=http://idconsumer.com/update?transaction_id=a6b5c41
</pre></div>
<a name="store"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.6"></a><h3>6.
Store Message</h3>
<p>
The store message is used to store personal identity
information to the OpenID Provider; it provides the means
for an RP to transfer to the OP attributes that the user
may consider useful, such as by providing them to other RPs.
The supported length for attribute aliases MUST be at least
32 characters.
</p>
<p>
The manner in which the OP processes the attribute payload in a
store request if out of scope of this document.
</p>
<a name="store_request"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.6.1"></a><h3>6.1.
Store Request Format</h3>
<p>
With the exception of "openid.ax.mode", all of the following
request fields are OPTIONAL. Any alias referred to in a
"openid.ax.value.<alias>" or
"openid.ax.value.<alias>.<number>" parameter MUST
have an associated "openid.ax.type.<alias>" parameter.
</p>
<p>
</p>
<blockquote class="text"><dl>
<dt>openid.ax.mode</dt>
<dd>
<blockquote class="text">
<p>
REQUIRED. Value: "store_request".
</p>
</blockquote>
</dd>
<dt>openid.ax.type.<alias></dt>
<dd>
<blockquote class="text">
<p>
The value of this parameter specifies the type identifier
URI for an attribute in the sore request.
The <alias> will further be used to identify
the attribute being exchanged.
</p>
<p>
Attribute aliases MUST NOT contain newline and colon characters,
as specified in the Data Formats / Protocol Messages section of
<a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a>; they also MUST
NOT contain commas (",") and periods (".").
</p>
</blockquote>
</dd>
<dt>openid.ax.count.<alias></dt>
<dd>
<blockquote class="text">
<p>
The number of values sent for the attribute referred to
as <alias>. If present, it MUST be greater than
zero.
</p>
</blockquote>
</dd>
<dt>openid.ax.value.<alias></dt>
<dd>
<blockquote class="text">
<p>
Assigns a value to the attribute referred to as
<alias>. This parameter format MUST be used if
"openid.ax.count.<alias>" is not sent.
</p>
</blockquote>
</dd>
<dt>openid.ax.value.<alias>.<number></dt>
<dd>
<blockquote class="text">
<p>
Assigns a value to the attribute referred to as
<alias>. The <number> uniquely identifies the
index of the value, ranging from one to the value specified
by "openid.ax.count.<alias>". This parameter format
MUST be used if "openid.ax.count.<alias>" is sent,
and the number of these parameters MUST be equal to the
value specified by "openid.ax.count.<alias>".
</p>
</blockquote>
</dd>
</dl></blockquote><p>
</p>
<p>
</p><div style="display: table; width: 0pt; margin-left: 3em; margin-right: auto;"><pre>
openid.ns.ax=http://openid.net/srv/ax/1.0
openid.ax.mode=store_request
openid.ax.type.fname=http://example.com/schema/fullname
openid.ax.value.fname=Bob Smith
openid.ax.type.fav_movie=http://example.com/schema/favourite_movie
openid.ax.count.fav_movie=2
openid.ax.value.fav_movie.1=Movie1
openid.ax.value.fav_movie.2=Movie2
</pre></div>
<a name="store_response"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.6.2"></a><h3>6.2.
Store Response Format</h3>
<a name="anchor6"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.6.2.1"></a><h3>6.2.1.
Storage Success</h3>
<p>
The successful store operation is indicated by the mode
parameter in the store response:
</p>
<p>
</p>
<blockquote class="text"><dl>
<dt>openid.ax.mode</dt>
<dd>
<blockquote class="text">
<p>
REQUIRED. Value: "store_response_success".
</p>
</blockquote>
</dd>
</dl></blockquote><p>
</p>
<p>
</p><div style="display: table; width: 0pt; margin-left: 3em; margin-right: auto;"><pre>
openid.ns.ax=http://openid.net/srv/ax/1.0
openid.ax.mode=store_response_success
</pre></div>
<a name="anchor7"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.6.2.2"></a><h3>6.2.2.
Storage Failure</h3>
<p>
A storage failure response has the following format:
</p>
<p>
</p>
<blockquote class="text"><dl>
<dt>openid.ax.mode</dt>
<dd>
<blockquote class="text">
<p>
REQUIRED. Value: "store_response_failure".
</p>
</blockquote>
</dd>
<dt>openid.ax.error</dt>
<dd>
<blockquote class="text">
<p>
OPTIONAL. Parameter describing the error condition
leading to the failure response, intended to be
presented to the user. The locale of the message
should match the locale of the HTTP message.
</p>
</blockquote>
</dd>
</dl></blockquote><p>
</p>
<p>
</p><div style="display: table; width: 0pt; margin-left: 3em; margin-right: auto;"><pre>
openid.ns.ax=http://openid.net/srv/ax/1.0
openid.ax.mode=store_response_failure
openid.ax.error=General storage failure
</pre></div>
<a name="anchor8"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.7"></a><h3>7.
Security Considerations</h3>
<p>
OpenID Attribute Exchange is an OpenID extension, and thus uses
OpenID Authentication request and response messages for exchanging
attributes.
</p>
<p>
See the "Security Considerations" section of
<a class="info" href="#OpenID.authentication-2.0">[OpenID.authentication‑2.0]<span> (</span><span class="info">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007.</span><span>)</span></a>.
</p>
<a name="anchor9"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.8"></a><h3>8.
Acknowledgements</h3>
<p>
John Merrells and other contributors to the document
'draft-merrells-dix'. Portions of that document were
re-used for this one.
</p>
<p>
Mark Wahl advised on how to deal with issues concerning the
encoding of attributes.
</p>
<a name="rfc.references"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.9"></a><h3>9.
References</h3>
<a name="rfc.references1"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<h3>9.1. Normative References</h3>
<table border="0" width="99%">
<tbody><tr><td class="author-text" valign="top"><a name="OpenID.authentication-2.0">[OpenID.authentication-2.0]</a></td>
<td class="author-text">specs@openid.net, “OpenID Authentication 2.0 - Final,” August 2007 (<a href="http://www.openid.net/specs/openid-authentication-2_0.txt">TXT</a>, <a href="http://www.openid.net/specs/openid-authentication-2_0.html">HTML</a>).</td></tr>
<tr><td class="author-text" valign="top"><a name="OpenID.value-lang-1.0">[OpenID.value-lang-1.0]</a></td>
<td class="author-text"><a href="mailto:mark.wahl@informed-control.com">Wahl, M.</a>, “<a href="http://www.ldap.com/1/spec/schema/openid-value-lang-1_0-00.html">Language Tags for OpenID Values</a>,” April 2007.</td></tr>
<tr><td class="author-text" valign="top"><a name="RFC2119">[RFC2119]</a></td>
<td class="author-text"><a href="mailto:sob@harvard.edu">Bradner, S.</a>, “<a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>,” BCP 14, RFC 2119, March 1997 (<a href="ftp://ftp.isi.edu/in-notes/rfc2119.txt">TXT</a>, <a href="http://xml.resource.org/public/rfc/html/rfc2119.html">HTML</a>, <a href="http://xml.resource.org/public/rfc/xml/rfc2119.xml">XML</a>).</td></tr>
<tr><td class="author-text" valign="top"><a name="RFC3629">[RFC3629]</a></td>
<td class="author-text">Yergeau, F., “<a href="http://tools.ietf.org/html/rfc3629">UTF-8, a transformation format of ISO 10646</a>,” STD 63, RFC 3629, November 2003 (<a href="ftp://ftp.isi.edu/in-notes/rfc3629.txt">TXT</a>).</td></tr>
</tbody></table>
<a name="rfc.references2"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<h3>9.2. Non-normative References</h3>
<table border="0" width="99%">
<tbody><tr><td class="author-text" valign="top"><a name="OpenID.axschema">[OpenID.axschema]</a></td>
<td class="author-text"><a href="mailto:dick@sxip.com">Hardt, D.</a>, “<a href="http://www.axschema.org/">Schema for OpenID Attribute Exchange</a>,” May 2007.</td></tr>
</tbody></table>
<a name="rfc.authors"></a><br><hr>
<table summary="layout" class="TOCbug" align="right" cellpadding="0" cellspacing="2"><tbody><tr><td class="TOCbug"><a href="#toc"> TOC </a></td></tr></tbody></table>
<h3>Authors' Addresses</h3>
<table border="0" cellpadding="0" cellspacing="0" width="99%">
<tbody><tr><td class="author-text"> </td>
<td class="author-text">Dick Hardt</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Sxip Identity</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">798 Beatty Street</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Vancouver, BC V6B 2M1</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">CA</td></tr>
<tr><td class="author" align="right">Email: </td>
<td class="author-text"><a href="mailto:dick@sxip.com">dick@sxip.com</a></td></tr>
<tr><td class="author" align="right">URI: </td>
<td class="author-text"><a href="http://sxip.com/">http://sxip.com/</a></td></tr>
<tr cellpadding="3"><td> </td><td> </td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Johnny Bufu</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Sxip Identity</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">798 Beatty Street</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Vancouver, BC V6B 2M1</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">CA</td></tr>
<tr><td class="author" align="right">Email: </td>
<td class="author-text"><a href="mailto:johnny@sxip.com">johnny@sxip.com</a></td></tr>
<tr><td class="author" align="right">URI: </td>
<td class="author-text"><a href="http://sxip.com/">http://sxip.com/</a></td></tr>
<tr cellpadding="3"><td> </td><td> </td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Josh Hoyt</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">JanRain</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">5331 SW Macadam Ave. #375</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Portland, OR 97239</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">US</td></tr>
<tr><td class="author" align="right">Email: </td>
<td class="author-text"><a href="mailto:josh@janrain.com">josh@janrain.com</a></td></tr>
<tr><td class="author" align="right">URI: </td>
<td class="author-text"><a href="http://janrain.com/">http://janrain.com/</a></td></tr>
</tbody></table>
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