IvoaDataModel < IVOA

IVOA Web>IvoaDataModel (2025-03-07, PaulHarrison) (raw view)

---+ IVOA Data Model Working Group

%TOC{depth="3"}%
---++ Introduction

_The role of the Data Modeling group is to provide a framework for the description of metadata attached to observed or simulated data. <br /> The activity of the Data Model WG activity focuses on logical relationships between these metadata, examines how an astronomer wants to retrieve, process and interpret astronomical data, and provides an architecture to handle them. What is defined in this WG can then be re-used in the protocols defined by the DAL WG or in VO aware applications ._
---++ Participation

Membership of this working group is informal as people and projects come and go. To join see our page on [[IVOA.HowToParticipate][How to participate]]

---+++ Progress Meetings

<br />The DM working group conducts, with varying levels of regularity, running meetings to discuss the progress of ongoing work and organize our efforts.<br>
The [[IVOA.IvoaDMRunningMeetings][DM Running Meeting Page]] is available to:  
   * Find day/time of the next scheduled meeting
   * Add discussion items for addition to an upcoming meeting agenda
   * Provide an access point to meeting notes.
The list is currently rather incomplete, but should improve going forward.

---+++ WG Roadmaps
Each group updates a roadmap of the goals and priorities for the upcoming semester.
These are consolidated and organized at the TCG level: 
   * See the [[https://wiki.ivoa.net/twiki/bin/view/IVOA/IvoaTCG#IVOA_Technical_Assessment_and_Ro][TCG roadmap]]

---+++ Mailing-list

<br /> dm@ivoa.net
   * info - subscribe/unsubscribe/edit: [[http://mail.ivoa.net/mailman/listinfo/dm][listinfo form]]
   * Working group discussions: [[http://www.ivoa.net/forum/dm][archive]]

---++ Standards and Documents

Here is a graphic illustrating the dependencies between data models used in the IVOA framework.

<img width="768" alt="DataModelDependencyGraphic.png" src="%ATTACHURLPATH%/DataModelDependencyGraphic.png" height="593" />

---+++ Standards repository
The [[https://www.ivoa.net/documents/][IVOA Documents and Standards repository]] is the official resource for all current standards and release candidates that are ready for general review.

---+++ Development repository
The IVOA has been migrating the development work for standards to Git repositories.  Prior to this, most development work was being managed by a Volute repository.<br>
The following table lists all current data model documents along with references to their development repository and/or project twiki page(s).<br>
These can be useful for submitting issues, participating in discussion, and directly engaging in project development.

| *Data Model*  | *Version* | *State*  | *Development Repository* | *Project Twiki Page* |
| Characterisation | 1.13 | REC | None | | 
| Coordinates | 1.0 | REC | [[https://github.com/ivoa-std/CoordinateDM][git]] | [[STC2][twiki]] | 
| Cube     | 1.0 | WD | [[https://volute.g-vo.org/svn/trunk/projects/dm/CubeDM-1.0/doc][Volute]], [[https://github.com/ivoa-std/CubeDM][git (TBD)]] | | 
| !DatasetMetadata | 1.0 | WD | [[https://github.com/ivoa-std/DatasetDM][git]] | | 
| !MANGO | 1.0 | WD | [[https://github.com/ivoa-std/MANGO][git]] | [[MANGO-1_0][twiki]] | 
| Measurements | 1.0 | REC | [[https://github.com/ivoa-std/MeasurementDM][git]] | [[STC2][twiki]] | 
| !MIVOT | 1.0 | REC | [[https://github.com/ivoa-std/ModelInstanceInVot][git]] | | 
| !ObsCore | 1.1 | REC | None | [[https://wiki.ivoa.net/twiki/bin/view/IVOA/ObsCoreDMvOnedotOne][twiki]], [[https://wiki.ivoa.net/twiki/bin/view/IVOA/ObsCore-1_1-Errata][Errata]] | 
| !ObsCore - radio extension | 1.0 | PR | [[https://github.com/ivoa-std/ObsCoreExtensionForRadioData][git]] | |
| !ObsCore - time extension | 1.0 | WD | [[https://github.com/ivoa-std/ObscoreTimeExtension][git]] | | 
| !ObsLocTap | 1.0 | REC | [[https://github.com/ivoa-std/ObsLocTAP][git]] | | 
| Photometry | 1.1 | REC | [[https://github.com/ivoa-std/PhotDM][git]] | [[IVOA.PhotDMv1-1][twiki]] |
| Provenance | 1.0 | REC | [[https://github.com/ivoa-std/ProvenanceDM][git]] | [[ObservationProvenanceDataModel][twiki]] | 
| Simulation  | 1.0 | REC | None | | 
| Spectral | 1.2 | REC | [[https://github.com/ivoa-std/SpectrumDM][git]] | | 
| Spectral Lines | 1.0 | REC | None | | 
|              | 2.0 | [[SSLDM][RFC]] (%RED%cancelled%ENDCOLOR%) | [[https://volute.g-vo.org/svn/trunk/projects/dm/ssldm][Volute]] | | 
| !STC      | 1.33 | REC | None | | 
| Transform | 1.0 | WD | [[https://github.com/ivoa-std/TransformDM][git]] | [[STC2][twiki]] | 
| !CAOM | 2.5 | WD | [[https://github.com/opencadc/CAOM][cadc-git]] | | 
| VO-DML | 1.0 | REC | [[https://github.com/ivoa/vo-dml][git]] |[[https://ivoa.github.io/vo-dml/][VO-DML tools]] | 

---+++ Implementation Requirements for Data Models

The "IVOA Document Standards" standard has a broad outline of the implementation requirements for IVOA standards. These requirements fit best into the higher level standards for applications and protocols than for data models themselves. At the Oct 2017 interop in Trieste, the following implementation requirements for Data Model Standards was agreed upon, which allow the models to be vetted against their requirements and use cases, without needing full science use cases to be implemented.
   * VO-DML models must validate against schema
   * Serializations which touch each entity of the model. These serializations may be 'fake' (ie: not based on actual data files), and are to be produced by the modeler as unit tests/examples.
   * Real world serializations covering use cases, produced by others following the model, in a mutually agreed upon format.
   * Software which interprets these serializations and demonstrates proper interpretation of the content.

---+++ General presentations on the DM modeling effort
Here are general presentations about the data modeling effort in the VO.
   * [[%ATTACHURL%/Louys_Mireille_30876-AdassTalk.pdf][DataModels in the Virtual Observatory Framework]]


---++ Projects

---+++ Active Projects
   * Source Data Model:
      * Source and Catalog <span style="color: #000066;">Requirement </span>[[SourceCatalogs][<span style="color: #000066;">survey</span>]]
      * Source DM and Workshop 2021: [[https://wiki.ivoa.net/twiki/bin/view/IVOA/SourceCatalogs][see here]]
      * Project migrates to MANGO data model - providing a generic framework which applies to this project.
   * Multi-Dimensional Data Model:
      * The project encompasses the description of Multi-Dimensional data products, from pixelated Images to n-dimensional hypercubes
      * The concept is that this single N-Dimensional Cube model should form the framework from which specialized data products can be defined.
      * As such: it forms the basis for supporting these products-of-interest in the community
         * Spectra (!SpectralDM v2.0), including Eschelle spectra
         * !TimeSeries
         * Event Lists
         * Pixellated images ( [[IVOA.ImageDM][ImageDM v1.0]])
      * The Cube model has been demonstrated to satisfy the requirements of these products, but lacks the implemented science oriented usage threads needed to gain general support.
         * We are working closely with the formation of a High Energy Interest Group, which we hope will bring resources and motivation to help see this project to fruition.
   * [[VODML_1_1][VO-DML 1.1]]

---+++ Proposed Projects
   * IVOA Note for FITS serializations
      * discussion started as question about lightcurve data model, but was concluding with a proposal to develop an IVOA Note with ‘preferred’ serializations for various products in FITS format.
      * see [[http://mail.ivoa.net/pipermail/dm/2024-June/006476.html][DM mail thread]]
   * [[CharacterisationDataModel][Characterisation]] v2.0 
      * Project to create vo-dml compliant version of the model.
      * Currently idle.. pending resource availability
   * Proposal Data Model
      * Data model for making Observation Proposals. It is being created as project within The Opticon RadioNet Pilot (https://www.orp-h2020.eu)
      * see [[https://github.com/ivoa/ProposalDM][git repository]]
   * [[STC2][STC-2.0]]:
      * Project to create vo-dml compliant version of STC
      * The project has been broken up, with separate models covering portions of the domain space covered by STC-1
         * Coords, Measurements, Transforms - completed or in progress
         * Regions, Intervals, ?? - TBD
   * [[IVOA.VODML-Mapping][VODML-Mapping]]:
      * Project to develop an annotation syntax mapping VOTable serializations to VO-DML compliant models.
      * The initial syntax proposal was rejected;
      * An alternative syntax was developed as !MIVOT

---+++ Topic Pages
   * [[IVOA.UTYPES][UTYPEs discussion:]] Closed with decision to adopt VO-DML
   * Mapping hands-on session [[https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2018VODML][page]] (May 2018)
   * High Energy physics data modeled & serialised with VO tools [[VO4HighEnergy][page]]
   * Running meeting AstrPyVO MIVOT [[AstroPyVOMivot][page]]
   * Obscore 1.1-Next [[https://wiki.ivoa.net/twiki/bin/view/IVOA/ObsCore11Next][wiki page]]


---++ Archival Project Reference Information

---+++ RFC pages for our standards.
| *Project*  | *Version*  | *RFC comments* |
| Characterization | 1.13 | [[CharacterisationDataModelRFC][RFC]] | 
| Coordinates | 1.0 | [[CoordsRFC][RFC-1]], [[CoordsRFC2][RFC-2]] |
| Measurements | 1.0 | [[MeasRFC][RFC-1]], [[MeasRFC2][RFC-2]] |
| !ObsCore | 1.0 | [[ObsCoreRFC][RFC]] |
|                 | 1.1 | [[ObscCore1dot1RFC][RFC]] |
| !ObsLocTAP | 1.0 | [[ObsLocTAP10RFC ][RFC]] |
| Photometry | 1.0 | [[PhotDM10RFC][RFC]] |
|                    | 1.1 | [[PhotDM11RFC][RFC]] |
| Provenance | 1.0 | [[ProvenanceRFC][RFC-1]], [[ProvenanceRFC2][RFC-2]] |
| Simulation | 1.0 | [[SimRFC][RFC]] |
| Spectrum  | 1.0 | [[SpectrumDataModelRFC][RFC]] |
|                  | 2.0 | [[Spectral2RFC][RFC-1]], [[SpectralDM2.Spectral2RFCr2][RFC-2]] %RED%canceled%ENDCOLOR%|
|                  | 1.2 | [[SpectrumDM12RFC][RFC]] |
| Spectral Lines | 2.0 | [[SSLDM][RFC]] |
| VO-DML | 1.0 | [[VODML1RFC][RFC]] |

---+++ Older IVOA Drafts and Related Documents
   * Quantity model current drafts ([[%ATTACHURL%/qty.v0.2.ps][.ps]], [[%ATTACHURL%/qty.v0.2.pdf][.pdf]])
   * Quantity model serialization examples ([[http://hea-www.harvard.edu/~jcm/vo/docs/qexamples/qxml.html][.html]])
   * Observation model current drafts ([[%ATTACHURL%/obs.v0.2.ps][.ps]], [[%ATTACHURL%/qty.v0.2.pdf][.pdf]])
   * 2004 [[http://www.ivoa.net/Documents/latest/LinearSTC.html][Linear STC]]: linear (command line) implementation of STC (v1.2).
   * 2002 [[http://alinda.u-strasbg.fr/IDHA/lastmodel/][IDHA Data Model for Astronomical Images]]: modeling of the acquisition process and data products
   * 2005 [[%ATTACHURL%/Characterisation_Note_20051129.pdf][Characterisation_Note_20051129.pdf]]: Characterization DM draft Note
   * [[%ATTACHURL%/spec96d.pdf][spec96d.pdf]]: Spectrum DM version 0.96 latest (Victoria)
   * [[%ATTACHURL%/spec97d.pdf][spec97d.pdf]]: Alternative Spectrum DM with STC
   * [[%ATTACHURL%/SourceDM_Moscow_2006.pdf][SourceDM_Moscow_2006.pdf]]: Source Catalog Data Model Moscow Sept 2006
   * [[%ATTACHURL%/CharacterisationWDversion1.0.pdf][CharacterisationWDversion1.0.pdf]]: Characterisation Data Model
   * [[%ATTACHURL%/CharacterisationIvoadraft-v1.1.pdf][update of CharacterisationIvoadraft-v1.1.pdf]]: Characterisation Model Working draft version 1.1
   * [[%ATTACHURL%/ivoa_char_2d_image_tutorial_1.0.pdf][ivoa_char_2d_image_tutorial_1.0.pdf]]: User's guide for Characterisation DM by Alberto Micol
   * [[%ATTACHURL%/CharacterisationImplementationv1.1.pdf][CharacterisationImplementationv1.1.pdf]]: Implementations of the Characterisation DM v1.1
<span style="color: #630000; font-size: 17px; font-weight: bold; line-height: 1em; background-color: transparent;">Projects using data models</span>

Virtual Observatory Projects working on Data models and their implementations should list themselves here. *** to fill and update***
   * [[http:/][ObservatoireStrasbourg]] 
      * [[http://][SAADA]] !CharDM and !ObsCore

   * [[http://cdsweb.u-strasbg.fr][CDS]] 
      1 Aladin portal
      1 CAMEA, an interactive tool for Characterisation metadata publishing
      1 Vizier + Saada: interface for products associated with Vizier sources
   * [[http://http://lerma.obspm.fr/][Lerma- Paris]] 
      1 Aspid-SR !CharDM


---+++ Meetings

Most of our face-to-face activity takes place during IVOA Interoperabiltiy Meetings. Follow the Data Model Page links to locate agendas, presentation slides, and action items.
| ||||
| *Interop* | *Main page* | *DM pageRole* ||
| *Shanghai, China (15-19 May 2017)* | InterOpMay2017 | InterOpMay2017-DM ||
| *Trieste, Italy (21-23 Oct 2016)* | InterOpOct2016 | InteropOct2016DM ||
| *Cape Town, Sth Africa (9-13 May 2016)* | InterOpMay2016 | InterOpMay2016 ||
| *Sydney, Australia(30/10 - 01/11 2016)* | InterOpOct2015 | InteropOct2015DM  ||
| *Sesto, Italy (14-19 Jun 2015)* | InterOpJune2015 | InterOpJune2015DM ||
| *Banff, Canada (10-12 Oct 2014)* | InterOpOct2014 | InterOpOct2014DM ||
| *Madrid, Spain (18-23 May 2014)* | InterOpMay2014 | InterOpMay2014DM ||
| *Heidelberg, Germany (12-17 May 2013)* | InterOpMay2013 | InterOpMay2013DM ||
| *Sao Paulo, Brazil (22-26 Oct 2012)* | InterOpOct2012 | InterOpOct2012DM ||
| *Urbana, USA (21-25 May 2012)* | InterOpMay2012 | InterOpMay2012DM ||
| *Pune, India (17-21 Oct 2011)* | InterOpOct2011 | InterOpOct2011DM ||
| *Naples, Italy (16-20 May 2011)* | InterOpMay2011 | InterOpMay2011DM ||
| *Nara, Japan (7-11 Dec 2010)* | InterOpDec2010 | InterOpDec2010DataModel ||
| *Victoria, Canada (17-21 May 2010)* | InterOpMay2010 | InterOpMay2010DM ||
| *Strasbourg, France(19-23 May 2009)* | InterOpMay2009 | DMInteropStrasbourg ||
| *Garching, Germany(19-23 Nov 2009)* | InterOpNov2009 | InterOpNov2009DM ||
| *Trieste, Italy (19-23 May 2008)* | InterOpMay2008 | InterOpMay2008DataModels ||
| *Cambridge, UK (27-28 Sep 2007)* | InterOpSep2007 | InterOpSep2007DataModel ||
| *Beijing, China (14-18 May 2007)* | InterOpMay2007 | InterOpMay2007DataModel ||
| *Moscow, Russia (18-21 Sep 2006)* | InterOpSep2006 | InterOpSep2006DM ||
| *Victoria, Canada (14-19 May 2006)* | InterOpMay2006 | InterOpMay2006DataModel ||
| *Madrid, Spain (6-7 Oct 2005)* | InterOpOct2005 | InterOpOct2005DataModel ||
| *Kyoto, Japan (16-20 May 2005)* | InterOpMay2005 | InterOpMay2005DataModel ||
| *Pune, India (27-29 Sept 2004)* | InterOpSep2004 | InterOpSep2004DataModel ||
| *Cambridge, Mass. USA (23-28 May 2004)* | InterOpMay2004 | InterOpMay2004DataModel ||
| *Strasbourg (16-17 Oct 2003)* | InterOpOct2003 | InterOpOct2003Registry ||
| *Cambridge, UK (12-16 May 2003)* | InterOpMay2003 | InterOpMay2003DataModel ||
---++ Involved People
| *Name* | *Country* | *Organization* | *Role* |
| *[[IVOA.JonathanMcDowell][Jonathan McDowell]]* | USA | !CfA, Boston ||
| *[[IVOA.FrancoisBonnarel][Francois Bonnarel]]* | France | CDS Strasbourg ||
| *[[IVOA.IgorChilingarian][Igor Chilingarian]]* | USA | CFA ||
| *[[MarieLiseDubernet][Marie Lise Dubernet]]* | France | Paris Observatory ||
| *[[IVOA.MireilleLouys][Mireille Louys]]* | France | CDS/ICube Laboratory,  University of  Strasbourg ||
| *[[IVOA.GerardLemson][Gerard Lemson]]* | USA | JHU ||
| *[[IVOA.Alberto Micol][Alberto Micol]]* | Germany | ESO ||
| *[[NicolasMoreau][Nicolas Moreau]]* | France | Paris Observatory ||
| *[[PedroOsuna][Pedro Osuna]]* | Spain | European Space Agency / ESAC ||
| *[[IVOA.ArnoldRots][ArnoldRots]]* | USA | !CfA, Boston ||
| *[[IVOA.Anita Richards][Anita Richards]]* | UK | Jodrell Bank ||
| *[[JesusSalgado][Jesus Salgado]]* | Spain | ESA/ESAC ||
| *[[JuanDeDiosSantanderVela][J.D. Santander-Vela]]* | Germany | ESO / Archive dpt ||
| *[[Arancha Delgado ]]* | Germany  | ESO / Archive dpt  ||
| *[[PetrSkoda][Petr Skoda]]* | Czech Rep. | Astron Inst. of Acad. Sciences ||
| *[[OmarLaurino][OmarLaurino]]* | USA | Harvard-Smithsonian ||
| *[[KristinRiebe][KristinRiebe]]* | Germany | GAVO, AIP, Potsdam (Germany) ||
| *[[MathieuServillat][MathieuServillat]]* | France | LUTH - Observatoire de Paris | Vice-Chair |
| *[[MarkCresitelloDittmar][Mark Cresitello-Dittmar]]* | USA | CfA, Boston | Chair |
| *[[LaurentMichel][Laurent Michel]]* | France | SSC XMM-Newton, Strasbourg ||
| *[[MicheleSanguillon][Michele Sanguillon]]* | France | Montpellier ||
| *[[Ole Streicher][Ole Streicher]]* | Germany | GAVO, AIP, Potsdam ||

Please put your name here if you wish ...
---++ Other DM Meetings
   * ADASS 2021: BoF TAP and the data models [[TapandTheDMs][TapandTheDMs]]
   * Check the above Interop pages for DM WG sessions
   * <span style="background-color: transparent;">ESO/Garching, Jan 2004: Data Model Technical Meeting 4 </span><span style="background-color: transparent;">[[%ATTACHURL%/dmtm4.pdf][Draft 0.1 of Observation model]]</span>
   * Baltimore, Dec 2003: Data Model Technical Meeting 3 (no minutes yet; see draft 0.2 of Quantity)
   * <span style="background-color: transparent;">ESO/Garching on Jan. 23/24, 2003: </span><span style="background-color: transparent;">[[IVOA.DataModel23012003][Data Model Sessions]]</span><span style="background-color: transparent;"> minutes (WG creation and planning)</span>
   * Cambridge MA, Oct 2002: Data Model Technical Meeting 1 [[http://hea-www.harvard.edu/~jcm/vo/dmtm/dmtm.html][presentations & minutes]]
<!--
      * Set ALLOWTOPICRENAME = IVOA.TWikiAdminGroup, IVOA.MarkCresitelloDittmar
-->

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	CharacterisationWDversion1.0.pdf	r1	manage	1762.9 K	2006-10-20 - 17:44	MireilleLouys	Characterisation Data Model
pdf	Characterisation_Note_20051129.pdf	r1	manage	1250.5 K	2005-12-21 - 23:50	FrancoisBonnarel	Characterization DM draft Note
png	DataModelDependencyGraphic.png	r4 r3 r2 r1	manage	180.8 K	2024-10-23 - 17:34	MarkCresitelloDittmar
doc	DomainModelv0.9.1.doc	r1	manage	1733.0 K	2004-01-29 - 07:57	GerardLemson	Rough and incomplete first draft
png	ImageDMcomments.png	r4 r3 r2 r1	manage	71.3 K	2012-02-28 - 14:39	MireilleLouys	Overview on data model dependencies and re-use
pdf	Louys_Mireille_30876-AdassTalk.pdf	r1	manage	1371.8 K	2016-12-20 - 19:30	MireilleLouys	ADASS Talk "Datamodels in the IVOA Framework" pdf version
pptx	Louys_Mireille_30876-finale.pptx	r2 r1	manage	3127.2 K	2016-10-21 - 13:05	MireilleLouys	ADASS Talk "Datamodels in the IVOA Framework"/names corrected
pdf	NSA-DM-v0.4.0.pdf	r1	manage	178.6 K	2004-08-20 - 22:12	PhillipWarner	NOAO Science Archive Domain Model (snapshot)
pdf	Poona_2004_Catalogue_DM.pdf	r1	manage	69.6 K	2005-02-01 - 10:56	PedroOsuna	[CATALOGUE]Kick-off presentation at Poona 2004
pdf	SourceDM_Moscow_2006.pdf	r1	manage	430.5 K	2006-09-19 - 11:03	InakiOrtiz	Source Catalog Data Model Moscow Sept 2006
pdf	dmtm4.pdf	r1	manage	156.7 K	2004-03-10 - 02:02	JonathanMcDowell	DM WG Tech Meeting 4 minutes
png	imageDM.png	r1	manage	4.9 K	2011-06-03 - 09:41	MireilleLouys	Overview on data model dependencies and re-use
pdf	map51.pdf	r1	manage	122.8 K	2004-05-25 - 05:04	JonathanMcDowell	[MAPPING] Draft v0.51
pdf	obs.v0.2.pdf	r1	manage	291.3 K	2004-03-10 - 00:24	JonathanMcDowell	[OBSERVATION] draft (pdf)
ps	obs.v0.2.ps	r1	manage	3296.8 K	2004-03-10 - 00:23	JonathanMcDowell	[OBSERVATION] draft
pdf	obs23.pdf	r1	manage	249.4 K	2004-05-25 - 04:16	JonathanMcDowell	[OBSERVATION] draft V0.23
pdf	qty.v0.2.pdf	r1	manage	363.2 K	2004-03-10 - 00:18	JonathanMcDowell	[QUANTITY] draft (pdf)
ps	qty.v0.2.ps	r1	manage	616.1 K	2004-03-10 - 00:16	JonathanMcDowell	[QUANTITY] draft
pdf	qty23.pdf	r1	manage	196.9 K	2004-05-25 - 04:01	JonathanMcDowell	[QUANTITY] revised draft
pdf	spec0.5.pdf	r1	manage	150.4 K	2004-05-25 - 03:55	JonathanMcDowell	[SPECTRA] Draft DM for SSAP
pdf	spec96d.pdf	r1	manage	208.5 K	2006-05-14 - 00:31	JonathanMcDowell	Spectrum DM version 0.96 latest (Victoria)
pdf	spec97d.pdf	r1	manage	211.2 K	2006-05-14 - 09:49	JonathanMcDowell	Alternative Spectrum DM with STC
pdf	spec98c.pdf	r3 r2 r1	manage	217.2 K	2006-09-05 - 13:44	JonathanMcDowell	Revised Spectrum DM
pdf	stc-jcm.v1.pdf	r1	manage	141.3 K	2004-04-11 - 00:56	JonathanMcDowell	[OBSERVATION] STC description
pdf	stc-jcm.v2.pdf	r1	manage	151.5 K	2004-05-25 - 03:56	JonathanMcDowell	[OBSERVATION] STC description V2
txt	stcimp.txt	r1	manage	2.4 K	2007-04-13 - 09:29	JonathanMcDowell	Note on STC Implementation Status