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

2. IVOA, Trieste, DM 2008-05-22Gerard 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

3. IVOA, Trieste, DM 2008-05-22Gerard 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

4. IVOA, Trieste, DM 2008-05-22Gerard Lemson SimDB ADQL VOTable query put SimDB/XML 1 2 get simdbId (=ivoID?) SimDB/XML 3 SimDB architecture (schematic)

5. IVOA, Trieste, DM 2008-05-22Gerard 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

6. IVOA, Trieste, DM 2008-05-22Gerard 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)

7. IVOA, Trieste, DM 2008-05-22Gerard 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

8. IVOA, Trieste, DM 2008-05-22Gerard 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)

9. IVOA, Trieste, DM 2008-05-22Gerard 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)

10. IVOA, Trieste, DM 2008-05-22Gerard Lemson SimDB links Development completely open: http://volute.googlecode.com/svn/trunk/projects/theory/snapdm/ UML: XMI: input/SimDB_DM.xmlinput/SimDB_DM.xml images : input/images/input/images/ representations, “physical models” (auto-generated): “intermediate representation” output /SimDB_DM_INTERMEDIATE.xmloutput /SimDB_DM_INTERMEDIATE.xml RDB: output/ddl/output/ddl/ XML schema: output/schema/output/schema/ HTML: output/html/ (with UTYPEs)output/html/ TAP: output/tap/output/tap/ Java: output/java/output/java/ Documentation Note (HTML): doc/note/SimDB-note.html first draft, in need of updates after this weekdoc/note/SimDB-note.html

11. IVOA, Trieste, DM 2008-05-22Gerard Lemson SimDB/DM elements Packages simdb (root) object protocol experiment project Resource Protocol Experiment Project

12. IVOA, Trieste, DM 2008-05-22Gerard Lemson SimDB/DM elements ObjectType TargetObjectType, TargetProcess, RepresentationObjectType Property property group Snapshot ObjectCollection Characterisation Webservice (link to SimDAP)

13. IVOA, Trieste, DM 2008-05-22Gerard 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 ??

14. IVOA, Trieste, DM 2008-05-22Gerard 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). More via email.