SIMPLE Working Group M. Garcia-Martin
Internet-Draft Nokia
Intended status: Standards Track December 17, 2006
Expires: June 20, 2007
The Presence-specific Dictionary for the Signaling Compression (Sigcomp)
Framework
draft-garcia-simple-presence-dictionary-01.txt
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This Internet-Draft will expire on June 20, 2007.
Copyright Notice
Copyright (C) The IETF Trust (2006).
Abstract
The Session Initiation Protocol (SIP) [4] is a text-based protocol
for initiating and managing communication sessions. The protocol is
extended by the SIP-events framework [5] to provide, e.g.,
subscriptions and notifications to presence information that are
carried in presence documents [8]. SIP can be compressed by using
Signaling Compression (SigComp) [2], which is enhanced by using the
SIP/SDP dictionary [7] to achieve better compression rates. However,
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the SIP/SDP dictionary [7] is not able to increase the compression
factor of (typically lengthy) presence documents. This memo defines
the presence-specific static dictionary that SigComp may use in order
to achieve higher efficiency. The dictionary is compression
algorithm independent.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Design considerations . . . . . . . . . . . . . . . . . . . . 4
4. Binary representation of the presence-specific static
dictionary . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8.1. Normative References . . . . . . . . . . . . . . . . . . . 11
8.2. Informational References . . . . . . . . . . . . . . . . . 11
Appendix A. Input strings to the presence-specific static
dictionary . . . . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 19
Intellectual Property and Copyright Statements . . . . . . . . . . 20
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1. Introduction
The Session Initiation Protocol (SIP) [4] is extended by the SIP-
events framework [5] to provide, e.g., subscriptions and
notifications to presence information. The presence information is
typically carried in Extended Markup Language XML documents that are
compliant with a given XML schema. For example, the Presence
Information Data Format (PIDF) [8] defines the format for the basic
document that supplies presence information. Typically, PIDF is used
in combination with other extensions to provide a richer user
experience, among others: the Presence Data Model [10], Rich Presence
Extensions to PIDF (RPID) [11], Contact Information in PIDF (CIPID)
[12], or Timed Presence Extensions to PIDF [13].
Typically, presence documents can contain large bulks of data. The
size of this data is dependent on the number of presentities that a
watcher is subscribed to and the amount of information supplied by
the presentity. This can impose a problem in environments where
resources are scare (e.g., such as low bandwidth links with high
latency) and the presence service is offered at low or no cost. This
is the case, e.g., of some wireless network and devices. It is
reasonable to try to minimize the impact of bringing the presence
service to wireless networks under these circumstances.
Work has been done to mitigate the impact of transferring large
amounts of presence documents between endpoints. For example, the
Partial PIDF [15] reduces the amount of data transferred between the
endpoints.
On the other hand, the signaling compression mechanisms specified in
SigComp [2] provide a multiple compression/decompression algorithm
framework to compress and decompress text-based protocols such as
SIP. When compression is used in SIP, the compression achieves its
maximum rate once a few message exchanges have taken place. This is
due to the fact that the first message the compressor sends to the
decompressor is only partially compressed, as there is not a previous
stored state to compress against. As the goal is to compress as much
as possible, it seems sensible to investigate a mechanism to boost
the compression rate from the first message.
RFC 3485 [7] defines a the static dictionary for SIP [4] and SDP [9].
The dictionary is to be used in conjunction with SIP, SDP and
SigComp. The static SIP/SDP dictionary constitutes a SigComp state
that can be referenced in the first SIP message that the compressor
sends out. The dictionary boosts the compression of SIP and SDP, but
unfortunately, does not have any effect in XML-based presence
documents.
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It sounds reasonable to define a presence-specific static dictionary
that can be used in conjunction with SIP, and Sigcomp. This
dictionary can coexist with the static SIP/SDP dictionary defined in
RFC 3485 [7]. Sigcomp endpoints will announce the availability of
one or both dictionaries during the Sigcomp initialization phase.
Our initial simulations when developing this dictionary reveal that,
once the current mitigation mechanisms are applied (e.g., Sigcomp,
partial notification, partial publication), a further compression
factor of 10% can be achieved when Sigcomp uses the presence-specific
static dictionary.
2. Terminology
In this document, the key words "MUST", "MUST NOT", "REQUIRED",
"SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT
RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as
described in BCP 14, RFC 2119 [1] and indicate requirement levels for
compliant implementations.
3. Design considerations
The static presence dictionary is a collection of well-known strings
that appear in most of the presence documents used by SIP. The
dictionary is not a comprehensive list of reserved words, but it
includes many of the strings that appear in presence documents.
The presence static dictionary is unique and MAY be available in
SigComp implementations for SIP that support the presence service.
The dictionary is not intended to evolve as presence evolve. It is
defined once, and stays as is forever. This solves the problems of
updating, upgrading and finding out the dictionary that is supported
at the remote end when several versions of the same dictionary
coexist.
Appendix A contains the collection of strings that were contributed
to the presence static dictionary. The appendix includes references
to the documents that define those strings.
While this appendix is of an informative nature, Section 4 gives the
normative binary form of the presence-specific static dictionary.
This is the dictionary that is included in the SigComp
implementation. This dictionary has been formed from the collection
of individual dictionaries given in Appendix A.
The input set is a collection of UTF-8 [6] encoded character strings.
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The appendix provides a table where each row represents an entry.
Each entry contains the string that actually occurs in the
dictionary, its priority (see below), its offset from the first octet
and its length (both in hexadecimal), and one or more references that
elucidate why this string is expected to occur in presence documents.
Note: Length in this document always refers to octets.
The columns in the table are described as follows:
String: represents the UTF-8 string that is inserted into the
dictionary. Note that the quotes (") are not part of the string
itself.
Pr: indicates the priority of this string within the dictionary.
Some compression algorithms, such as DEFLATE [3], offer an
increased efficiency when the most commonly used strings are
located at the bottom of the dictionary. To facilitate generating
a dictionary that has the most frequently occurring strings
further down at the bottom, we have decided to allocate a priority
to each string in the dictionary. Priorities range from 1 until
5. A low value in the priority column (e.g., 1) indicates that we
believe in a high probability of finding the string in a presence
document. A high value in the priority column (e.g., 5) indicates
lower probability of finding the string in a presence document.
This is typically the case for less frequent extensions or
optional infrequent XML elements or attributes.
Off: indicates the hexadecimal offset of the entry with respect to
the first octet in the dictionary. Note that several strings in
the collections can share space in the dictionary if they exhibit
suitable common substrings.
Len: the length of the string in octets in hexadecimal.
References: contains one or more references to the specification and
the section within the specification where the string is defined.
Note that the strings stored in the dictionary are case sensitive.
(Again, the strings do not comprise the quotes ("), they are just
shown here to increase the readability).
4. Binary representation of the presence-specific static dictionary
This section contains the binary form of the presence-specific static
dictionary that is loaded into SigComp as a state.
The binary SigComp dictionary is comprised of two parts, the
concatenation of which serves as the state value of the state item: A
string subset, which contains all strings in the contributing
collections as a substring (roughly ordered such that strings with
low priority numbers occur at the end), and a table subset, which
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contains pairs of length and offset values for all the strings in the
contributing collections. In each of these pairs, the length is
stored as a one-byte value, and the offset is stored as a two-byte
value that has had 1024 added to the offset (this allows direct
referencing from the stored value if the dictionary state has been
loaded at address 1024).
The intention is that all compression algorithms will be able to use
the (or part of the) string subset, and some compression methods,
notably those that are related to the LZ78 family, will also use the
table in order to form an initial set of tokens for that compression
method. The text below therefore gives examples for referencing both
the table subset and the string subset of the dictionary state item.
As defined in section 3.3.3 in the Signaling Compression
specification [1], a SigComp state is characterized by a certain set
of information. For the presence-specific static dictionary, the
information in the following Figure 3 fully characterizes the state
item.
Note that the string subset of the dictionary can be accessed using:
STATE-ACCESS (%ps, 6, 0, 0x073D, %sa, 0),
and the table subset can be accessed using:
STATE-ACCESS (%ps, 6, 0x073D, 0x03A2, %sa, 0),
where %ps points to UDVM memory containing
0xfc2dd39046b5
and %sa is the desired destination address in UDVM memory (with UDVM
byte copying rules applied).
If only a subset of the dictionary up to a specific priority is
desired (e.g., to save UDVM space), the values for the third and
forth operand in these STATE-ACCESS instructions can be changed to:
Priorities String String Table Table
desired offset length offset length
========== ====== ====== ====== ======
1 only 0x0601 0x013C 0x073D 0x0042
1..2 0x050A 0x0233 0x073D 0x0072
1..3 0x032D 0x0410 0x073D 0x0111
1..4 0x028A 0x04B3 0x073D 0x0162
1..5 0x0000 0x073D 0x073D 0x03A2
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Priority Table
The state item consists of the following elements:
Name: Value:
===================== ========================
state_identifier 0xfc2dd39046b5dc6ad5695eca084576aa86a461ed
state_length 0x0ADF
state_address 0 (not relevant for the dictionary)
state_instruction 0 (not relevant for the dictionary)
minimum_access_length 6
state_value Representation of the table below.
State item table
0000 636f 6e76 656e 7469 6f6e 2d63 656e 7465 convention-cente
0010 726d 696e 6174 6564 6973 7472 6163 7465 rminatedistracte
0020 6469 6e6e 6572 766f 7573 6368 6f6f 6c61 dinnervouschoola
0030 7373 6f63 6961 7465 6d62 6172 7261 7373 ssociatembarrass
0040 6564 6561 6374 6976 6174 6564 6973 6170 edeactivatedisap
0050 706f 696e 7465 6465 7363 7269 7074 696f pointedescriptio
0060 6e3d 636c 7562 7265 616b 6661 7374 6565 n=clubreakfastee
0070 7269 6e67 6f76 6572 6e6d 656e 7472 6169 ringovernmentrai
0080 6e2d 7374 6174 696f 6e2d 7468 652d 7068 n-station-the-ph
0090 6f6e 6575 7472 616c 6173 742d 696e 7075 oneutralast-inpu
00A0 743d 6875 6d69 6c69 6174 6564 6570 7265 t=humiliatedepre
00B0 7373 6564 7075 626c 6963 2d74 7261 6e73 ssedpublic-trans
00C0 706f 7274 6f6f 6272 6967 6874 6f3d 7072 portoobrighto=pr
00D0 6573 656e 7461 7469 6f6e 6f69 7379 7365 esentationoisyse
00E0 6c66 7265 6967 6874 696d 656f 7574 646f lfreightimeoutdo
00F0 6f72 7368 6f63 6b65 6470 6c61 7966 756c orshockedplayful
0100 6f6f 6b69 6e67 2d66 6f72 2d77 6f72 6b69 ooking-for-worki
0110 6e67 6169 7270 6f72 7468 6561 7465 7265 ngairportheatere
0120 6a65 6374 6564 756e 636f 6d66 6f72 7461 jecteduncomforta
0130 626c 6578 636c 7564 653d 696e 7465 7265 blexclude=intere
0140 7374 6564 6973 6775 7374 6564 6172 656e stedisgustedaren
0150 6162 6c65 643d 7265 6c69 6576 6564 7661 abled=relievedva
0160 6361 7469 6f6e 7374 7265 7373 6564 6170 cationstressedap
0170 7072 6f76 6564 686f 7370 6974 616c 6f6e provedhospitalon
0180 656c 796a 6561 6c6f 7573 6c65 6570 7969 elyjealousleepyi
0190 6d70 7265 7373 6564 6172 6b77 6169 7469 mpressedarkwaiti
01A0 6e67 7569 6c74 7970 6f73 7461 6c68 6f74 nguiltypostalhot
01B0 656c 696e 636c 7564 653d 776f 7272 6965 elinclude=worrie
01C0 6461 6e6e 6f79 6564 7072 6566 6978 3d70 dannoyedprefix=p
01D0 6172 6b69 6e67 756e 6b6e 6f77 6e70 6c61 arkingunknownpla
01E0 7969 6e67 686f 6c69 6461 7968 756d 626c yingholidayhumbl
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01F0 6564 6173 6861 6d65 6448 4e53 5453 6875 edashamedHNSTShu
0200 6e67 7279 6372 616e 6b79 616d 617a 6564 ngrycrankyamazed
0210 6672 6965 6e64 6661 6d69 6c79 7072 6973 friendfamilypris
0220 6f6e 696e 5f61 7765 626f 7265 6461 6e67 onin_aweboredang
0230 7279 7072 6f75 6471 7569 6574 6861 7070 ryproudquiethapp
0240 7962 7261 7665 6d65 616c 636f 6c64 6875 ybravemealcoldhu
0250 7274 6261 6e6b 6361 6665 7572 6e3d 6177 rtbankcafeurn=aw
0260 6179 6275 7379 504f 4450 5244 7368 794e aybusyPODPRDshyN
0270 414d 4c4f 4346 4c52 4c4d 4b48 4e4f 5043 AMLOCFLRLMKHNOPC
0280 4132 4133 4134 4135 4136 7375 6273 6372 A2A3A4A5A6subscr
0290 6962 6566 6f72 6574 7261 6e73 6d69 7373 ibeforetransmiss
02A0 696f 6e2d 616c 6c6f 7765 6475 7261 7469 ion-allowedurati
02B0 6f6e 2d73 7562 7363 7269 6265 643d 7065 on-subscribed=pe
02C0 726d 616e 656e 742d 6162 7365 6e63 6578 rmanent-absencex
02D0 7069 7261 7469 6f6e 3d77 6174 6572 6372 piration=watercr
02E0 6166 7465 7265 6d6f 7665 3d3a 6369 7669 afteremove=:civi
02F0 634c 6f63 6f6e 7465 6e74 6564 3a62 6173 cLocontented:bas
0300 6963 506f 6c69 6379 636c 6563 6861 6e67 icPolicyclechang
0310 6564 696e 7374 616e 6365 6175 6469 6f75 edinstanceaudiou
0320 6e74 696c 3d77 6861 7475 7269 3d73 6572 ntil=whaturi=ser
0330 7669 6365 2d63 6c61 7373 726f 6f6d 7573 vice-classroomus
0340 7455 6e64 6572 7374 616e 6469 7370 6c61 tUnderstandispla
0350 792d 6e61 6d65 3d66 6c69 7274 6174 696f y-name=flirtatio
0360 7573 6167 652d 7275 6c65 7370 6563 7461 usage-rulespecta
0370 746f 7265 6d6f 7273 6566 756c 6c3a 7469 toremorsefull:ti
0380 6d65 642d 7374 6174 7573 2d69 636f 6e73 med-status-icons
0390 7472 7563 7469 6f6e 6f72 6573 6f75 7263 tructionoresourc
03A0 653d 3a72 6c6d 696e 6170 7072 6f70 7269 e=:rlminappropri
03B0 6174 6578 7465 726e 616c 2d72 756c 6573 atexternal-rules
03C0 6574 696d 652d 6f66 6673 6574 7269 6767 etime-offsetrigg
03D0 6572 6573 6964 656e 6365 7761 7463 6865 eresidencewatche
03E0 722d 6c69 7374 6164 6975 6d65 7468 6f64 r-listadiumethod
03F0 6669 6c74 6572 6573 746c 6573 7370 6865 filterestlessphe
0400 7265 7465 6e74 696f 6e2d 6578 7069 7279 retention-expiry
0410 6175 746f 6d6f 6269 6c65 7665 6e74 3d73 automobilevent=s
0420 746f 7265 6c61 7469 6f6e 7368 6970 726f torelationshipro
0430 7669 6465 642d 6279 3d69 6e64 7573 7472 vided-by=industr
0440 6961 6c6f 6361 7469 6f6e 2d69 6e66 6f66 ialocation-infof
0450 6665 6e64 6564 3a73 696d 706c 652d 6669 fended:simple-fi
0460 6c74 6572 2d73 6574 6869 7273 7479 636f lter-sethirstyco
0470 7572 6965 723a 7761 7463 6865 7269 6e66 urier:watcherinf
0480 6f66 6669 6365 686f 6d65 7061 6765 6f70 officehomepageop
0490 7269 7661 6379 6275 732d 7374 6174 696f rivacybus-statio
04A0 6e6d 6565 7469 6e67 6166 7261 6964 6c65 nmeetingafraidle
04B0 2d74 6872 6573 686f 6c64 3d6d 6561 6e78 -threshold=meanx
04C0 696f 7573 6f75 6e64 6572 7761 7970 6163 iousounderwaypac
04D0 6b61 6765 3d70 6c61 6365 2d69 7374 6174 kage=place-istat
04E0 653d 6361 6c6d 6f6f 6479 3a67 656f 7072 e=calmoody:geopr
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04F0 6976 3130 6163 7469 7665 6672 6f6d 3d70 iv10activefrom=p
0500 6f73 3d63 6172 6477 733d 736c 6565 7069 os=cardws=sleepi
0510 6e67 6976 6575 7072 6f76 6174 696f 6e6f ngiveuprovationo
0520 7465 2d77 656c 6c69 6272 6172 7977 6172 te-wellibrarywar
0530 6568 6f75 7365 722d 696e 7075 7472 6176 ehouser-inputrav
0540 656c 6563 7472 6f6e 6963 6976 6963 4164 electronicivicAd
0550 6472 6573 7375 7270 7269 7365 6465 7669 dressurprisedevi
0560 6365 4964 3a64 6174 612d 6d6f 6465 6c62 ceId:data-modelb
0570 6f74 6865 7265 706c 6163 652d 6f66 2d77 othereplace-of-w
0580 6f72 7368 6970 6c61 6365 2d74 7970 653d orshiplace-type=
0590 3a78 6d6c 2d70 6174 6368 2d6f 7073 7570 :xml-patch-opsup
05A0 6572 7669 736f 7265 7374 6175 7261 6e74 ervisorestaurant
05B0 7275 636b 6169 7263 7261 6674 696d 6573 ruckaircraftimes
05C0 7461 6d70 6572 666f 726d 616e 6365 7863 tamperformancexc
05D0 6974 6564 696e 2d70 6572 736f 6e72 656d itedin-personrem
05E0 6f76 6564 3a63 6970 6964 662d 6675 6c6c oved:cipidf-full
05F0 5374 6174 653d 7361 6464 6564 3a72 7069 State=sadded:rpi
0600 6475 726e 3a69 6574 663a 7061 7261 6d73 durn:ietf:params
0610 3a78 6d6c 3a6e 732d 6269 6e64 696e 6773 :xml:ns-bindings
0620 6172 6361 7374 6963 6f6e 6675 7365 6475 arcasticonfusedu
0630 726e 3a69 6574 663a 7061 7261 6d73 3a78 rn:ietf:params:x
0640 6d6c 3a73 6368 656d 6170 706f 696e 746d ml:schemappointm
0650 656e 7469 7479 3d63 6f6e 7461 6374 6976 entity=contactiv
0660 6974 6965 7368 6f70 7069 6e67 2d61 7265 itieshopping-are
0670 6173 6f6e 3d3a 7069 6466 2d64 6966 6672 ason=:pidf-diffr
0680 7573 7472 6174 6564 6f6d 6169 6e3d 696e ustratedomain=in
0690 6469 676e 616e 7476 6964 656f 7065 6e64 dignantvideopend
06A0 696e 6772 756d 7079 6375 7269 6f75 7374 ingrumpycurioust
06B0 6174 7573 3d69 6e76 696e 6369 626c 656e atus=invinciblen
06C0 636f 6469 6e67 3d66 616c 7365 7269 6f75 coding=falseriou
06D0 7374 7265 6574 6173 7369 7374 616e 7472 streetassistantr
06E0 7565 696e 2d74 7261 6e73 6974 7570 6c65 uein-transituple
06F0 696e 5f6c 6f76 6572 7369 6f6e 3d70 6172 in_loversion=par
0700 7469 616c 616e 673d 3c3f 786d 6c6e 733d tialang=<?xmlns=
0710 636c 6f73 656c 3d73 6963 6b70 7269 6f72 closel=sickprior
0720 6974 793d 7072 6573 656e 6365 6369 643d ity=presencecid=
0730 5554 462d 383f 3e41 312e 302f 3e05 0b08 UTF-8?>A1.0/>...
0740 080a f503 0b38 090a be07 0b30 060b 0a16 .....8.....0....
0750 0a01 050a 7507 0a50 020b 3b08 0b24 050a ....u..P..;..$..
0760 eb03 0b2d 040a de07 0a57 050a c706 0784 ...-.....W......
0770 0506 fd04 0a9b 050b 1009 0b1b 050b 0304 ................
0780 091e 0909 bb09 09e7 0b09 6408 095c 0609 ..........d..\e..
0790 5c06 09d7 0509 fc0e 0990 1a0a 2f03 09f7 \e.........../...
07A0 0709 7406 06e4 040b 130a 0a75 090a 760e ..t........u..v.
07B0 073d 0a0a 5b04 08e5 0509 7005 0735 0808 .=..[.....p..5..
07C0 d50a 085e 0b0a 150a 0a15 0a09 8507 088f ...^............
07D0 0c08 220d 072d 0607 fc0b 0784 0b07 c10a .."..-..........
07E0 0933 0608 f404 08ac 0609 e404 0903 0c07 .3..............
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07F0 4a08 0886 0407 8b03 0a47 0508 c306 07f0 J........G......
0800 0808 cd03 0907 0507 a204 07e2 0407 5208 ..............R.
0810 0799 0408 ff05 098b 0a08 ea0a 09ec 0708 ................
0820 8c0d 0842 0b07 6006 07ea 0b08 2d0c 0875 ...B..`.....-..u
0830 0b08 7606 08dc 0c07 da09 0799 0808 cd07 ..v.............
0840 07da 070a ae06 0819 0508 fa0e 0856 0507 .............V..
0850 1a05 0a97 0407 b10d 077d 0c07 7e06 0691 .........}..~...
0860 0506 e004 096f 0607 1f0c 06fc 0909 1e09 .....o..........
0870 06eb 0c09 4916 0695 1008 0004 0725 0707 ....I........%..
0880 cb04 0729 0707 0b05 09f7 0709 dd10 07b2 ...)............
0890 0b06 ce14 06aa 0407 7907 0afd 0807 1208 ........y.......
08A0 0566 0909 5407 0867 0705 ba05 04d9 0205 .f..T..g........
08B0 0105 0637 0904 c304 0597 0d05 260d 07a6 ...7........&...
08C0 0809 b407 0512 0505 4c0a 0810 0406 5203 ........L.....R.
08D0 0439 0306 620b 0896 0406 5609 0735 0404 .9..b.....V..5..
08E0 620c 078c 1104 0005 0706 0a04 7308 0576 b...........s..v
08F0 0505 ad0a 0839 0709 2606 0880 0804 eb07 .....9..&.......
0900 05cf 1009 7606 061c 0604 b410 04b4 0907 ....v...........
0910 d10a 09a6 0604 290d 0a64 0707 e405 081f ......)..d......
0920 060a d007 0518 0504 7c0d 047c 0509 af08 ........|..|....
0930 08c5 0909 2d05 06d9 0a06 d907 05d6 0b0a ....-...........
0940 4809 0ad6 0904 2f06 0616 0606 1004 04de H...../.........
0950 0a09 9d07 086e 0a09 4007 04e1 0909 d406 .....n..@.......
0960 05a7 0406 5e07 086e 0a09 4007 04e1 0909 ....^..n..@.....
0970 d406 05a7 0904 6504 0886 0405 0b04 0662 ......e........b
0980 0604 200c 0456 0705 e40a 0ae2 1004 ff0f .. ..V..........
0990 08ac 0b04 9704 0646 0708 a10c 0487 0b09 .......F........
09A0 c311 06be 0705 dd0c 04ce 080a 6408 090a ............d...
09B0 0907 6a08 046c 0609 3c02 0a96 0805 5e07 ..j..l..<.....^.
09C0 050b 0709 7f06 08a8 0606 0a05 062d 0705 .............-..
09D0 c107 08bd 0705 f205 0628 0506 4104 08e2 .........(..A...
09E0 0406 4a08 0a27 0906 f306 0604 070a a809 ..J..'..........
09F0 04ab 0c04 4b09 0543 0a04 170b 0437 0709 ....K..C.....7..
0A00 cd0b 0757 0a0a 7e06 0aa2 020b 3702 0680 ...W..~.....7...
0A10 0206 8202 0684 0206 8602 0688 0306 6903 ..............i.
0A20 0666 0305 fb03 067b 0305 f903 0678 0306 .f.....{.....x..
0A30 7203 0675 0306 6f02 067e 0605 a105 063c r..u..o..~.....<
0A40 0305 ad07 05eb 0a04 a206 05fe 0406 4e09 ..............N.
0A50 058f 0606 220d 074a 070a f007 0a9c 0705 ...."..J........
0A60 9b0a 040e 090a 8e09 068a 0805 6e0b 0441 ............n..A
0A70 0909 1608 051e 0704 e706 0911 0a07 970a ................
0A80 053a 0a0a b507 0583 0605 7d04 08bb 0508 .:........}.....
0A90 e507 0423 0704 9108 084e 0705 c804 065a ...#.....N.....Z
0AA0 0704 f905 0632 0805 5607 0a87 0706 e408 .....2..V.......
0AB0 054e 0805 b208 0532 0a07 7208 07f5 0309 .N.....2..r.....
0AC0 f603 04cb 0308 3609 0a1f 070a ca07 04f2 ......6.........
0AD0 0306 6c04 0b17 040b 2c06 0589 070a 6e ..l.....,.....n
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Figure 3: Binary representation of the presence-specific static
dictionary for SigComp
5. Security Considerations
TBD
6. IANA Considerations
TBD
7. Acknowledgements
The author would like to thank Miraj Mostafa, Pekka Pessi, and
Catalin Ionescu for their persistent convincing arguments to
demonstrate the benefit of this dictionary. Thanks to Carsten
Bormann for providing assistance with the dictionary generation.
Adam Roach created the software that automatically generates the
binary dictionary.
8. References
8.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Price, R., Bormann, C., Christoffersson, J., Hannu, H., Liu,
Z., and J. Rosenberg, "Signaling Compression (SigComp)",
RFC 3320, January 2003.
8.2. Informational References
[3] Deutsch, P., "DEFLATE Compressed Data Format Specification
version 1.3", RFC 1951, May 1996.
[4] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP:
Session Initiation Protocol", RFC 3261, June 2002.
[5] Roach, A., "Session Initiation Protocol (SIP)-Specific Event
Notification", RFC 3265, June 2002.
[6] Yergeau, F., "UTF-8, a transformation format of ISO 10646",
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STD 63, RFC 3629, November 2003.
[7] Garcia-Martin, M., Bormann, C., Ott, J., Price, R., and A.
Roach, "The Session Initiation Protocol (SIP) and Session
Description Protocol (SDP) Static Dictionary for Signaling
Compression (SigComp)", RFC 3485, February 2003.
[8] Sugano, H., Fujimoto, S., Klyne, G., Bateman, A., Carr, W., and
J. Peterson, "Presence Information Data Format (PIDF)",
RFC 3863, August 2004.
[9] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", RFC 4566, July 2006.
[10] Rosenberg, J., "A Data Model for Presence", RFC 4479,
July 2006.
[11] Schulzrinne, H., Gurbani, V., Kyzivat, P., and J. Rosenberg,
"RPID: Rich Presence Extensions to the Presence Information
Data Format (PIDF)", RFC 4480, July 2006.
[12] Schulzrinne, H., "CIPID: Contact Information for the Presence
Information Data Format", RFC 4482, July 2006.
[13] Schulzrinne, H., "Timed Presence Extensions to the Presence
Information Data Format (PIDF) to Indicate Status Information
for Past and Future Time Intervals", RFC 4481, July 2006.
[14] Urpalainen, J., "An Extensible Markup Language (XML) Patch
Operations Framework Utilizing XML Path Language (XPath)
Selectors", draft-ietf-simple-xml-patch-ops-02 (work in
progress), March 2006.
[15] Lonnfors, M., "Presence Information Data format (PIDF)
Extension for Partial Presence",
draft-ietf-simple-partial-pidf-format-07 (work in progress),
July 2006.
[16] Peterson, J., "A Presence-based GEOPRIV Location Object
Format", RFC 4119, December 2005.
[17] Rosenberg, J., "An Extensible Markup Language (XML) Based
Format for Watcher Information", RFC 3858, August 2004.
[18] Khartabil, H., Leppanen, E., Lonnfors, M., and J. Costa-
Requena, "An Extensible Markup Language (XML)-Based Format for
Event Notification Filtering", RFC 4661, September 2006.
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[19] Roach, A., Campbell, B., and J. Rosenberg, "A Session
Initiation Protocol (SIP) Event Notification Extension for
Resource Lists", RFC 4662, August 2006.
Appendix A. Input strings to the presence-specific static dictionary
String Pr Off Len References
===================================== == ==== ==== ==========
"<?xml" 1 0708 0005
"version=" 1 06F5 0008
"1.0" 1 0738 0003
"encoding=" 1 06BE 0009
"UTF-8?>" 1 0730 0007
"xmlns=" 1 070A 0006
"urn:ietf:params:xml:ns" 1 0601 0016 [8] 4.4
":pidf" 1 0675 0005 [8] 4.4
"entity=" 1 0650 0007 [8] 4.4
"/>" 1 073B 0002 [8] 4.4
"presence" 1 0724 0008 [8] 4.4
"tuple" 1 06EB 0005 [8] 4.4
"id=" 1 072D 0003 [8] 4.4
"note" 2 051E 0004 [8] 4.4
"contact" 1 0657 0007 [8] 4.4
"timestamp" 2 05BB 0009 [8] 4.4
"status" 1 0384 0006 [8] 4.4
"basic" 1 02FD 0005 [8] 4.4
"open" 1 069B 0004 [8] 4.4
"close" 1 0710 0005 [8] 4.4
"priority=" 1 071B 0009 [8] 4.4
"mustUnderstand" 3 033D 000E [8] 4.4
"true" 1 06DE 0004 [8] 4.4
"false" 1 06C7 0005 [8] 4.4
":data-model" 2 0564 000B [10] 5.1
"deviceId" 2 055C 0008 [10] 5.1
"device" 2 055C 0006 [10] 5.1
"person" 2 05D7 0006 [10] 5.1
":rpid" 2 05FC 0005 [11] 5
"activities" 3 065B 000A [11] 5
"unknown" 5 01D6 0007 [11] 5
"appointment" 5 0648 000B [11] 5
"away" 5 025E 0004 [11] 5
"breakfast" 5 0065 0009 [11] 5
"busy" 5 0262 0004 [11] 5
"dinner" 5 0020 0006 [11] 5
"holiday" 5 01E4 0007 [11] 5
"in-transit" 5 06E2 000A [11] 5
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"looking-for-work" 5 00FF 0010 [11] 5
"meal" 5 0246 0004 [11] 5
"meeting" 5 04A1 0007 [11] 5
"on-the-phone" 5 0087 000C [11] 5
"performance" 5 05C3 000B [11] 5
"permanent-absence" 5 02BE 0011 [11] 5
"playing" 5 01DD 0007 [11] 5
"presentation" 5 00CE 000C [11] 5
"shopping" 5 0664 0008 [11] 5
"sleeping" 5 050A 0008 [11] 5
"spectator" 5 036A 0009 [11] 5
"steering" 5 006C 0008 [11] 5
"travel" 5 053C 0006 [11] 5
"tv" 5 0696 0002 [11] 5
"vacation" 5 015E 0008 [11] 5
"working" 5 010B 0007 [11] 5
"worship" 5 057F 0007 [11] 5
"other" 3 0570 0005 [11] 5
"class" 3 0335 0005 [11] 5
"afraid" 5 04A8 0006 [11] 5
"amazed" 5 020A 0006 [11] 5
"angry" 5 022D 0005 [11] 5
"annoyed" 5 01C1 0007 [11] 5
"anxious" 5 04BD 0007 [11] 5
"ashamed" 5 01F2 0007 [11] 5
"bored" 5 0228 0005 [11] 5
"brave" 5 0241 0005 [11] 5
"calm" 5 04E2 0004 [11] 5
"cold" 5 024A 0004 [11] 5
"confused" 5 0627 0008 [11] 5
"contented" 5 02F3 0009 [11] 5
"cranky" 5 0204 0006 [11] 5
"curious" 5 06A8 0007 [11] 5
"depressed" 5 00AB 0009 [11] 5
"disappointed" 5 004B 000C [11] 5
"disgusted" 5 0143 0009 [11] 5
"distracted" 5 0017 000A [11] 5
"embarrassed" 5 0037 000B [11] 5
"excited" 5 05CD 0007 [11] 5
"flirtatious" 5 0357 000B [11] 5
"frustrated" 5 067E 000A [11] 5
"grumpy" 5 06A2 0006 [11] 5
"guilty" 5 01A1 0006 [11] 5
"happy" 5 023C 0005 [11] 5
"hot" 5 01AD 0003 [11] 5
"humbled" 5 01EB 0007 [11] 5
"humiliated" 5 00A2 000A [11] 5
"hungry" 5 01FE 0006 [11] 5
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"hurt" 5 024E 0004 [11] 5
"impressed" 5 018F 0009 [11] 5
"in_awe" 5 0222 0006 [11] 5
"in_love" 5 06F0 0007 [11] 5
"indignant" 5 068E 0009 [11] 5
"interested" 5 013A 000A [11] 5
"invincible" 5 06B5 000A [11] 5
"jealous" 5 0183 0007 [11] 5
"lonely" 5 017D 0006 [11] 5
"mean" 5 04BB 0004 [11] 5
"moody" 5 04E5 0005 [11] 5
"nervous" 5 0023 0007 [11] 5
"neutral" 5 0091 0007 [11] 5
"offended" 5 044E 0008 [11] 5
"playful" 5 00F9 0007 [11] 5
"proud" 5 0232 0005 [11] 5
"relieved" 5 0156 0008 [11] 5
"remorseful" 5 0372 000A [11] 5
"restless" 5 03F5 0008 [11] 5
"sad" 5 05F6 0003 [11] 5
"sarcastic" 5 061F 0009 [11] 5
"serious" 5 06CA 0007 [11] 5
"shocked" 5 00F2 0007 [11] 5
"shy" 5 026C 0003 [11] 5
"sick" 5 0717 0004 [11] 5
"sleepy" 5 0189 0006 [11] 5
"stressed" 5 0166 0008 [11] 5
"surprised" 5 0554 0009 [11] 5
"thirsty" 5 0467 0007 [11] 5
"worried" 5 01BA 0007 [11] 5
"mood" 3 04E5 0004 [11] 5
"place-is" 3 04D5 0008 [11] 5
"audio" 4 031A 0005 [11] 5
"noisy" 5 00D9 0005 [11] 5
"ok" 5 0101 0002 [11] 5
"quiet" 5 0237 0005 [11] 5
"video" 4 0697 0005 [11] 5
"toobright" 5 00C3 0009 [11] 5
"dark" 5 0197 0004 [11] 5
"text" 4 03B1 0004 [11] 5
"uncomfortable" 5 0126 000D [11] 5
"inappropriate" 5 03A6 000D [11] 5
"place-type" 3 0585 000A [11]
"aircraft" 5 05B4 0008 [11] 5
"airport" 5 0112 0007 [11] 5
"arena" 5 014C 0005 [11] 5
"automobile" 5 0410 000A [11] 5
"bank" 5 0252 0004 [11] 5
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"bar" 5 0039 0003 [11] 5
"bus" 5 0262 0003 [11] 5
"bus-station" 5 0496 000B [11] 5
"cafe" 5 0256 0004 [11] 5
"classroom" 5 0335 0009 [11] 5
"club" 5 0062 0004 [11] 5
"construction" 5 038C 000C [11] 5
"convention-center" 5 0000 0011 [11] 5
"cycle" 5 0306 0005 [11] 5
"government" 5 0073 000A [11] 5
"hospital" 5 0176 0008 [11] 5
"hotel" 5 01AD 0005 [11] 5
"industrial" 5 0439 000A [11] 5
"library" 5 0526 0007 [11] 5
"office" 5 0480 0006 [11] 5
"outdoors" 5 00EB 0008 [11] 5
"parking" 5 01CF 0007 [11] 5
"place-of-worship" 5 0576 0010 [11] 5
"prison" 5 021C 0006 [11] 5
"public" 5 00B4 0006 [11] 5
"public-transport" 5 00B4 0010 [11] 5
"residence" 5 03D1 0009 [11] 5
"restaurant" 5 05A6 000A [11] 5
"school" 5 0029 0006 [11] 5
"shopping-area" 5 0664 000D [11] 5
"stadium" 5 03E4 0007 [11] 5
"store" 5 041F 0005 [11] 5
"street" 5 06D0 0006 [11] 5
"theater" 5 0118 0007 [11] 5
"train" 5 007C 0005 [11] 5
"train-station" 5 007C 000D [11] 5
"truck" 5 05AF 0005 [11] 5
"underway" 5 04C5 0008 [11] 5
"warehouse" 5 052D 0009 [11] 5
"water" 5 02D9 0005 [11] 5
"watercraft" 5 02D9 000A [11] 5
"privacy" 3 048F 0007 [11] 5
"relationship" 3 0422 000C [11] 5
"assistant" 5 06D6 0009 [11] 5
"associate" 5 002F 0009 [11] 5
"family" 5 0216 0006 [11] 5
"friend" 5 0210 0006 [11] 5
"self" 5 00DE 0004 [11] 5
"supervisor" 5 059D 000A [11] 5
"courier" 5 046E 0007 [11] 5, [11] 5
"electronic" 5 0540 000A [11] 5, [11] 5
"freight" 5 00E1 0007 [11] 5, [11] 5
"in-person" 5 05D4 0009 [11] 5, [11] 5
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"postal" 5 01A7 0006 [11] 5, [11] 5
"service-class" 3 032D 000D [11] 5
"courier" 5 046E 0007 [11] 5, [11] 5
"electronic" 5 0540 000A [11] 5, [11] 5
"freight" 5 00E1 0007 [11] 5, [11] 5
"in-person" 5 05D4 0009 [11] 5, [11] 5
"postal" 5 01A7 0006 [11] 5, [11] 5
"sphere" 3 03FC 0006 [11] 5
"home" 5 0486 0004 [11] 5
"work" 5 010B 0004 [11] 5
"status-icon" 3 0384 000B [11] 5
"time-offset" 3 03C1 000B [11] 5
"description=" 5 0056 000C [11] 5
"user-input" 3 0533 000A [11] 5
"active" 3 04F4 0006 [11] 5
"idle" 3 04AC 0004 [11] 5
"idle-threshold=" 5 04AC 000F [11] 5
"last-input=" 5 0097 000B [11] 5
":cipid" 3 05E4 0006 [12] 5
"card" 3 0503 0004 [12] 5
"display-name" 3 034A 000C [12] 5
"homepage" 3 0486 0008 [12] 5
"icon" 3 038B 0004 [12] 5
"map" 3 0647 0003 [12] 5
"sound" 3 04C3 0005 [12] 5
":timed-status" 4 037D 000D [13] 5
"timed-status" 4 037E 000C [13] 5
"from=" 3 04FA 0005 [11] 5
"until=" 4 031F 0006 [13] 5
"urn:ietf:params:xml:schema" 2 062F 001A [14] 9
":xml-patch-ops" 2 0590 000E [14] 9
"add" 2 05F7 0003 [14] 9
"replace" 2 0574 0007 [14] 9
"remove" 2 02E4 0006 [14] 9
"sel=" 2 0713 0004 [14] 9
"pos=" 3 04FF 0004 [14] 9
"type=" 3 058B 0005 [14] 9
"ws=" 3 0507 0003 [14] 9
"before" 4 0291 0006 [14] 9
"after" 4 02E0 0005 [14] 9
"both" 4 056F 0004 [14] 9
":pidf-diff" 2 0675 000A [15] 7
"pidf-diff" 2 0676 0009 [15] 7
"pidf-full" 2 05E7 0009 [15] 7
":geopriv10" 3 04EA 000A [16] 2.2.5
":basicPolicy" 4 02FC 000C [16] 2.2.5
"geopriv" 3 048C 0007 [16] 2.2.5
"location-info" 3 0442 000D [16] 2.2.5
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"usage-rules" 3 0360 000B [16] 2.2.5
"method" 3 03EA 0006 [16] 2.2.5
"provided-by" 3 042D 000B [16] 2.2.5
"retransmission-allowed" 4 0295 0016 [16] 2.2.5
"retention-expiry" 4 0400 0010 [16] 2.2.5
"external-ruleset" 4 03B2 0010 [16] 2.2.5
"note-well" 4 051E 0009 [16] 2.2.5
":civicLoc" 4 02EB 0009 [16] 2.2.5
"civicAddress" 4 0549 000C [16] 2.2.5
"A1" 5 0737 0002 [16] 2.2.5
"A2" 5 0280 0002 [16] 2.2.5
"A3" 5 0282 0002 [16] 2.2.5
"A4" 5 0284 0002 [16] 2.2.5
"A5" 5 0286 0002 [16] 2.2.5
"A6" 5 0288 0002 [16] 2.2.5
"PRD" 5 0269 0003 [16] 2.2.5
"POD" 5 0266 0003 [16] 2.2.5
"STS" 5 01FB 0003 [16] 2.2.5
"HNO" 5 027B 0003 [16] 2.2.5
"HNS" 5 01F9 0003 [16] 2.2.5
"LMK" 5 0278 0003 [16] 2.2.5
"LOC" 5 0272 0003 [16] 2.2.5
"FLR" 5 0275 0003 [16] 2.2.5
"NAM" 5 026F 0003 [16] 2.2.5
"PC" 5 027E 0002 [16] 2.2.5
":watcherinfo" 3 0475 000C [17] 6
"watcherinfo" 3 0476 000B [17] 6
"state=" 3 04DC 0006 [17] 6
"full" 4 0379 0004 [17] 6
"partial" 4 06FD 0007 [17] 6
"watcher-list" 3 03DA 000C [17] 6
"resource=" 3 0399 0009 [17] 6
"package=" 3 04CD 0008 [17] 6, [18] 7
"watcher" 3 03DA 0007 [17] 6
"display-name=" 5 034A 000D [17] 6
"status=" 3 06AE 0007 [17] 6
"pending" 5 069C 0007 [17] 6
"waiting" 5 019B 0007 [17] 6
"terminated" 5 000E 000A [17] 6
"event=" 3 0419 0006 [17] 6
"subscribe" 5 028A 0009 [17] 6
"approved" 5 016E 0008 [17] 6
"deactivated" 5 0041 000B [17] 6
"provation" 5 0516 0009 [17] 6
"rejected" 5 011E 0008 [17] 6
"timeout" 5 00E7 0007 [17] 6
"giveup" 5 0511 0006 [17] 6
"noresource" 5 0397 000A [17] 6
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"expiration=" 4 02CE 000B [17] 6
"duration-subscribed=" 4 02AA 0014 [17] 6
"lang=" 1 0703 0005 [17] 6
":simple-filter" 3 0456 000E [18] 7
"filter-set" 3 045E 000A [18] 7
"ns-bindings" 3 0615 000B [18] 7
"ns-binding" 3 0615 000A [18] 7
"filter" 3 03F0 0006 [18] 7
"package=" 3 04CD 0008 [17] 6, [18] 7
"prefix=" 5 01C8 0007 [18] 7
"urn=" 5 025A 0004 [18] 7
"what" 4 0325 0004 [18] 7
"trigger" 4 03CB 0007 [18] 7
"uri=" 4 0329 0004 [18] 7
"domain=" 5 0687 0007 [18] 7
"remove=" 5 02E4 0007 [18] 7
"enabled=" 5 014E 0008 [18] 7
"include=" 5 01B2 0008 [18] 7
"exclude=" 5 0132 0008 [18] 7
"changed" 4 030B 0007 [18] 7
"added" 4 05F7 0005 [18] 7
"removed" 4 05DD 0007 [18] 7
"to=" 5 00CB 0003 [18] 7
"by=" 5 0436 0003 [18] 7
":rlmi" 3 03A2 0005 [19] 5.1
"list" 3 03E2 0004 [19] 5.1
"name" 3 0352 0004 [19] 5.1
"resource" 3 0399 0008 [19] 5.1
"fullState=" 3 05EC 000A [19] 5.1
"cid=" 5 072C 0004 [19] 5.1
"instance" 4 0312 0008 [19] 5.1
"reason=" 5 066E 0007 [19] 5.1
Input strings
Author's Address
Miguel A. Garcia-Martin
Nokia
P.O.Box 407
NOKIA GROUP, FIN 00045
Finland
Email: miguel.an.garcia@nokia.com
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Full Copyright Statement
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contained in BCP 78, and except as set forth therein, the authors
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Garcia-Martin Expires June 20, 2007 [Page 20]
