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   o  restless
   o  sad
   o  sarcastic
   o  serious
   o  shocked
   o  shy
   o  sick
   o  sleepy
   o  stressed
   o  surprised
   o  thirsty
   o  unknown
   o  worried

   Example:

     &lt;mood&gt;
       &lt;note&gt;I'm ready for the bar BOF!&lt;/note&gt;
       &lt;sleepy/&gt;
       &lt;thirsty/&gt;
     &lt;/mood&gt;

<SPAN class=h3><A name=section-3.6>3.6</A>.  Place-is Element</SPAN>

   The &lt;place-is&gt; element describes properties of the place the person
   is currently at.  This offers the watcher an indication of what kind
   of communication is likely to be successful.  Each major media type
   has its own set of attributes.  Omitting the element indicates that
   the property is unknown.

   For audio, we define the following attributes:

   noisy:  The person is in a place with a level of background noise
      that makes audio communications difficult.

   ok:  The environmental conditions are suitable for audio
      communications.

   quiet:  The person is in a place such as a library, restaurant, place
      of worship, or theater that discourages noise, conversation, and
      other distractions.

   unknown:  The place attributes for audio are unknown.

   For video, we define the following attributes:

   toobright:  The person is in a bright place, sufficient for good
      rendering on video.



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   ok:  The environmental conditions are suitable for video.

   dark:  The person is in a dark place, and thus the camera may not be
      able to capture a good image.

   unknown:  The place attributes for video are unknown.

   For text (real-time text and instant messaging), we define

   uncomfortable:  Typing or other text entry is uncomfortable.

   inappropriate:  Typing or other text entry is inappropriate, e.g.,
      since the user is in a vehicle or house of worship.

   ok:  The environmental conditions are suitable for text-based
      communications.

   unknown:  The place attributes for text are unknown.

   This list can be augmented by free-text values in a note or
   additional IANA-registered values (<A href="http://tools.ietf.org/html/rfc4480#section-7">Section 7</A>).

   The &lt;place-is&gt; element contains other elements, e.g.,

     &lt;place-is&gt;
       &lt;audio&gt;
         &lt;noisy /&gt;
       &lt;/audio&gt;
       &lt;video&gt;
         &lt;dark /&gt;
       &lt;/video&gt;
     &lt;/place-is&gt;

   The &lt;place-is&gt; element MAY be qualified with the 'from' and 'until'
   attributes as described in <A href="http://tools.ietf.org/html/rfc4480#section-3.1">Section 3.1</A>.

<SPAN class=h3><A name=section-3.7>3.7</A>.  Place-type Element</SPAN>

   The &lt;place-type&gt; element describes the type of place the person is
   currently at.  This offers the watcher an indication of what kind of
   communication is likely to be appropriate.  The initial set of values
   is contained in <A href="http://tools.ietf.org/html/rfc4589">RFC 4589</A> [<A title='"Location Types Registry"' href="http://tools.ietf.org/html/rfc4480#ref-12">12</A>].

   This list can be augmented by free-text values or additional IANA-
   registered values as described in <A href="http://tools.ietf.org/html/rfc4589">RFC 4589</A>.






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   The &lt;place-type&gt; element is a choice of elements, as in

     &lt;place-type&gt;
          &lt;pt:street/&gt;
     &lt;/place-type&gt;

   The &lt;place-type&gt; element MAY be qualified with the 'from' and 'until'
   attributes as described in <A href="http://tools.ietf.org/html/rfc4480#section-3.1">Section 3.1</A>.

<SPAN class=h3><A name=section-3.8>3.8</A>.  Privacy Element</SPAN>

   The &lt;privacy&gt; element indicates which types of communication third
   parties in the vicinity of the presentity are unlikely to be able to
   intercept accidentally or intentionally.  This does not in any way
   describe the privacy properties of the electronic communication
   channel, e.g., properties of the encryption algorithm or the network
   protocol used.

   audio: Inappropriate individuals are not likely to overhear audio
      communications.

   text:  Inappropriate individuals are not likely to see text
      communications.

   unknown:  This information is unknown.

   video:  Inappropriate individuals are not likely to see video
      communications.

      The &lt;privacy&gt; element can be used by logic executing on the
      watcher or by a composer to filter, sort and label tuples.  For
      example, a composer may have rules that limit the publication of
      tuples labeled "private" to a select subset of the watchers.

   The &lt;privacy&gt; element MAY be qualified with the 'from' and 'until'
   attributes as described in <A href="http://tools.ietf.org/html/rfc4480#section-3.1">Section 3.1</A>.

   Example:

     &lt;privacy&gt;
       &lt;text/&gt;
       &lt;audio/&gt;
     &lt;/privacy&gt;








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<SPAN class=h3><A name=section-3.9>3.9</A>.  Relationship Element</SPAN>

   The &lt;relationship&gt; element extends &lt;tuple&gt; and designates the type of
   relationship an alternate contact has with the presentity.  This
   element is provided only if the tuple refers to somebody other than
   the presentity.  Relationship values include "family", "friend",
   "associate" (e.g., for a colleague), "assistant", "supervisor",
   "self", and "unknown".  The default is "self".

   If a relationship is indicated, the URI in the &lt;contact&gt; element
   refers to the entity, such as the assistant, that has a relationship
   to the presentity, not the presentity itself.

   Like tuples without a &lt;relationship&gt; qualifier, the &lt;contact&gt; element
   for tuples labeled with a relationship can contain either a
   communication URI such as "im", "sip", "sips", "h323", "tel", or
   "mailto", or a presence URI, such as "pres" or "sip".

   Example:

     &lt;relationship&gt;
       &lt;friend/&gt;
     &lt;/relationship&gt;

<SPAN class=h3><A name=section-3.10>3.10</A>.  Service Class</SPAN>

   The &lt;service-class&gt; element extends &lt;tuple&gt; and designates the type
   of service offered.

   electronic:  Delivery of information by electronic means, i.e.,
      without delivering physical objects.  Examples include telephone,
      fax, email, instant messaging, and SMS.

   postal:  Delivery by the postal service, e.g., as a letter, parcel,
      or postcard.  Delivery could be to a post office box or central
      mailroom rather than the presentity's office location, for
      example.

   courier:  Delivery by messenger, overnight delivery, or courier.
      Courier-delivered messages are usually delivered to a receptionist
      rather than, say, a mailroom or receiving department.

   freight:  Delivery by freight carrier, typically of larger objects
      that are not sent by postal mail or courier.  The recipient is
      often the shipping department or a loading dock.

   in-person:  Describes the coordinates for visits in person, as by a
      visitor, i.e., usually somebody's office or residence.



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   unknown:  The type of service is unknown.

   Electronic service is implied if omitted.  The service types
   'postal', 'courier', 'freight', and 'in-person' MUST NOT be used
   unless the contact URI is empty.  Additional data elements defined
   elsewhere describe the physical service delivery address for the in-
   person, postal, or delivery services.  Such addresses might be
   specified in geospatial coordinates, civic addresses, or some
   specialized address format, e.g., for interstellar addresses or a
   company-specific delivery system.

   Example:

     &lt;service-class&gt;&lt;postal/&gt;&lt;/service-class&gt;

<SPAN class=h3><A name=section-3.11>3.11</A>.  Sphere Element</SPAN>

   The &lt;sphere&gt; element designates the current state and role that the
   person plays.  For example, it might describe whether the person is
   in a work mode, at home, or participating in activities related to
   some other organization such as the IETF or a church.  This document
   does not define names for these spheres except for two common ones,
   "work" and "home", as well as "unknown".

   Spheres allow the person to easily turn on or off certain rules that
   depend on what groups of people should be made aware of the person's
   status.  For example, if the person is a Boy Scout leader, he might
   set the sphere to "scouting" and then have a rule set that allows
   other scout masters in his troop to see his presence status.  As soon
   as he switches his status to "work", "home", or some other sphere,
   the fellow scouts would lose access.

   The &lt;sphere&gt; element MAY be qualified with the 'from' and 'until'
   attributes as described in <A href="http://tools.ietf.org/html/rfc4480#section-3.1">Section 3.1</A>.

   Example:

     &lt;sphere&gt;
       &lt;home/&gt;
     &lt;/sphere&gt;

<SPAN class=h3><A name=section-3.12>3.12</A>.  Status-Icon Element</SPAN>