(back to main)
This page is devoted to describing the SimDB data model (SimDB/DM from now on).

Current model

As described here all development can be followed on Volute. Particularly relevant for the discussion on this page is the data model in uml/SimDB_DM.xml. The previous versions as well as later working versions can be found in the history of this file, whilst older versions are under the input/ directory, such as version r902. I will try to keep track of the different versions and change logs below. At the bottom of the page the generated GraphViz image representing the last (checked in) version of the model. (NB need to ensure it is in synch with the actual model).

To be discussed

• OK on approach?
  • modelling: analysis(conceptual)->logical->physical
  • TAP+XML+UTYPE serialisations derived from logical model
• Identify main issues of model
  • sufficiently detailed resources?
  • characterisation, provenance etc (see separate page)
  • normalisation (problem for XML, little for TAP)
  • "queriability" (problem for TAP)
  • missing semantic vocabularies
  • quantities/units
• Clean up
  • documentation in the UML
  • Description of model in Note
• finalise the serialisation to UTYPEs
• finalise the serialisation to TAP (see IVOA.IVOATheorySimDBTAP)
• finalise the serialisation to XML schema ((see IVOA.IVOATheorySimDBREST)
• reuse by other specs
  • SimDAP
  • S3
• ...

Version history (link on heading):

Sometimes versions do not change in content, but nevrtheless produce different MagicDraw XMI documents. Sometimes this is due to different drawing, redrawing links or something like that. Here I only indicate the content changed. This I do by generating the SimDB_INTERMEDIATE.xml file and diffing those.

specification/

1089

• Changed cardinality of snapshot collection on Experiment. now 0..*
• a datatype StringLiteral was added. not really useful remnant of some experimenting. can be removed.
• Changed cardinality of representationObject collection on experiment. now 0..*
• Changed cardinality of objectCollecitoncollection on Snapshot. now 0..*
• Changed cardianlity of label attribute on ValidValue, from 1 to 0..1

1059

• Added option to refer to an external utype for each <>. Added one on Resource: otherutype="Reg:VOResource"

1034

• removed explicit dependency between simdb and IVOAValueTYpes packages again [this is all mainly caused by changes in how to represent explicitly how a model depends on the profile. Is an explict dependency required or not.
• PostProcessing no longer abstract.

1029

• no change in content.

1020

• Added Identity datatype to the IVOAValueTypes. [check whether this is necessray in the model or only for code generation?]
• Recreated the explicit dependency relation between the "simdb" and IVOAValueTypes" packages.
• Fixed the errors on Contact introduced in 898.

1012

• Removed the "model" package. This was used for code generation purposes only.

989

• removed explicit dependency from simdb package on IVOAValueTypes package
• Rename AccessibleExperiment to AccessibleResource and change its "experiment" reference to point to Resource iso Experiment and rename it to "resource".
• In Contact, INTRODUCED 2 ERRORSD
  • changed dattaype of telephone from string to Resource
  • created an attribute: unnamed1, of type Resource
• Renamed "experiment" colleciton on Project to "resource"
• added a "description" attribute to ProjectResource.
• removed the Pos3D datatype. [was onnly there as example of structured datatype]
• Removed ClusterFinder and ClusterDetection. PostProcessor and PostProcessing should be used.
• On PostProcessing added a reference to the PostProcessor, subsetting the protocol reference on Experiment.
• Added description attribute on InputData.
• Renamed AccessbileExperiment to AccessibleResource, and its "experiment" reference to "resurce", now pointin to Resource.

978

• No change in content

952

• Exact copy of, i.e. no change wrt prop-952

prop-951 (Mar 12, 2009 ,derived from input/902 !)

• ChildProtocol and ChildExperiment removed.

input/

1025

• WebService has AccessibleResource (was: AccessibleExperiment)collection, pointing to Resource. I.e. not only experiments are accessible.
• CompositeExperiment and CompositeProtocol have been removed. NB will be reintroduced in later model.
• ClusterDetection and ClusterFinder have been removed. Instead of these the more general PostProcessing and PostProcessor must be used. Those types are no longer abstract.
• PostProcessing has reference "protocol" to PostProcessor. This reference subsets Experiment's protocol reference.

902

887

(back to main)

---