(r3) IVOATheorySimDB_Check < IVOA

Tables contain points that have been discussed during the SimDB project (including preceding SNAP part).

Approach to SimDB

Item	OK	NOT OK	Comment
SNAP follows SSA:data model + protocol			(Victoria interop, 2006)
SimDB requires registry-like approach			Discussed in April 2007 SNAP meeting of core participants (up till then), Garching
SNAP->!SimDB+!SimDAP			formally announced in 2008 Trieste interop, agreed by "tiger team" before
SimDB is a protocol for finding interesting simulation and postprocessing experiments and their results
SimDB implements "queryData" part of "simple" DAL protocols
"getData" part is implemented by SimDAP or custom services

SimDB data modelling methodology

Item	OK	NOT OK	Comment
SimDB/DM represented in UML class diagram			UML aspect follows decision in Cambridge interop 2003. Class diagram seems obvious (?)
SimDB/UML is self documenting			All entities and classes must be properly documented. SimDB/Note gives background and context, UML model is in principle sufficient. This was decision of core designers (GL, RW, LB), presented in 2008 Trieste Interop
SimDB/DM's UML stored as XMI document (ASCII)			XMI is standard XML format for representing UML documents.
SimDB uses MagicDraw Community Edition 12.1 for the XMI			Freely available tool, ESO has commercial version. Should not be necessary to specify a tool, as XMI should deal with that, but in practice useful to "insist" on one
SimDB/DM uses a predefined UML profile			Aimed to simplify models and promote interoperability by presenting uniform DM langugage fo the IVOA. Restriction + extension of UML, currently informal (Appendix in Note) + formal (a UML2 profile generated by ESO, updated in course of design).
Propose an intermediate XML format for representing DMs following profile.			In practice very useful. Very much more readable than XMI. in principle hand-editable. Core of VO-URP TAP/XSD/HTML/UTYPE/Java/DDL/... generation.

SimDB/DM contents

Item	OK	NOT OK	Comment

"getData" services can be foud in SimDB

SimDB/TAP

Item	OK	NOT OK	Comment

SimDB is a TAP service			first discussed April 2007 Garching
SimDB's TAP_SCHEMA predefined			Allows for integration: same ADQL can be sent to all SimDB services.
SimDB/TAP_SCHEMA derived from SimDB/DM using predefined OR-mapping rules
SimDB/TAP's OR mapping rules uses

Topic revision: r3 - 2009-04-30 - GerardLemson

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