IVOA, Trieste, DM 2008-05-22Gerard Lemson SimDB Data Model IVOA interop, DM WG session Trieste, 2008-05-22.

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB Data Model

IVOA interop, DM WG session Trieste, 2008-05-22

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

“tiger team” Laurent Bourges Gerard Lemson Rick Wagner

Claudio Gheller Mireille Louys Patrizia Manzato Herve Wozniak

Ackn: Ugo Becciani, Jeremy Blaizot, Francois Bonnarel, Igor

Chillingarian, Norman Gray, Jaiwon Kim, Franck LePetit, Alex Szalay

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

What is SimDB ? = “Simulation Database”

- registry ? - portal ?

Online service for discovering and accessing numerical simulations

Exposes a relational database containing metadata describing simulations

Focused on “3+1D simulations” Provides for XML representation Defines access protocols for online access to

the database: put/get/query

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDBADQL

VOTable query

putSimDB/XML

1

2

getsimdbId(=ivoID?)

SimDB/XML

3

SimDB architecture (schematic)

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB use cases Management of institute’s simulation

resources San Diego (legacy) Trieste (legacy) Catania Horizon (Lyon (reference), Paris) MPA (reference)

Publication of resources local/remote (ala registry) generate metadata in simulation pipe line

Link resources to (SimDAP) services theory session 11AM

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB/RDB

Why Relational Database? because we have a complex, normalised

model for which we need an expressive query

language and the IVOA has such a language

(ADQL) which is relational

(ref Will O’Mullane, 2003)

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB/XML

Why custom XML (and not VOTable) ? because we have a complex, highly

hierarchical model and because it is the (IVOA)

mandated language for expressing such complex resources

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB/DM = UML2 Why UML?

because it is the de facto standard for data models,

with free tool support and a standard XML representation (XMI) with standardised extension and specialisation

mechanisms (Profiles) because it is highly expressive and

implementation neutral and because it is the adopted IVOA DM WG

standard for expressing data models (Cambridge 2003)

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

And because we can generate all the other representations from it!

RDB schema XML schema UTYPE-s TAP metadata

tap_schema tableset VODataService

Java/JPA+JAXB HTML .........

See tomorrow’s DM session (GL + Laurent Bourges)

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB links Development completely open:

http://volute.googlecode.com/svn/trunk/projects/theory/snapdm/

UML: XMI: input/SimDB_DM.xml images : input/images/

representations, “physical models” (auto-generated): “intermediate representation” output/SimDB_DM_INTERMEDIATE.xml RDB: output/ddl/ XML schema: output/schema/ HTML: output/html/ (with UTYPEs) TAP: output/tap/ Java: output/java/

Documentation Note (HTML): doc/note/SimDB-note.html

first draft, in need of updates after this week

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB/DM elements Packages

simdb (root) object protocol experiment project

Resource Protocol Experiment Project

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB/DM elements ObjectType

TargetObjectType, TargetProcess, RepresentationObjectType

Property property group

Snapshot ObjectCollection Characterisation

Webservice (link to SimDAP)

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB/DM issues Profile Normalisation level, e.g.

Experiment —> Protocol ParameterSetting —> InputParameter

Semantic vocabularies Quantity (i.e. units)

value/unit conversion factor to standard (per physical

quantity) ? Representing references others ??

IVOA, Trieste, DM 2008-05-22 Gerard Lemson

SimDB future Move to recommendation track cross-WG Focus Group

Members from current tiger team + DM, Registry, Semantics, DAL/TAP

Formal details in discussion in exec (I hope).

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