CADAC Data Model

This is an XML Schema implementation of simulation data model model being developed by RickWagner as part of the Computational Astrophysics Data Analysis Center. Some of is motivated by the Spectral Data Model, and much of it draws on the SNAP data model:

• SNAP UML diagrams
• SNAP XML Schema serialisations

Components

The building blocks of this data model are:

• Program--software that takes a set of parameters (and possibly input data), and outputs data.
• Simulation--collections of program execution, and possibly some characterization axes.
• SimulationRun--a record of the program execution, including the parameters and input data, and the resulting snapshots.
• Snapshot--a reference to the output data, possibly including some characterization values.

Schema

The Program and Simulation elements both have their own schemas, but they share two common XML Schema complex types (Cardinality and Datatype).

• Simulation.xsd Simulation XML Schema
• Program.xsd Program XML Schema
• BaseTypes.xsd Shared XML Schema

Both of these schemas inherit from the VOResource type. This is based on the assumption that it is easier for existing registries to handle Simulation and Program entries, if they start from this common basis.

Example Instance Documents

ProgramInstance.xml is a sample Program instance document, which validates against the Program schema. It partially describes Enzo, a hybrid AMR code.

SimulationInstance.xml is a sample Simulation instance document, which validates against the Simulation schema. It describes a mock Enzo run, and the results of running an analysis tool against the data.

Images

Program Schema Elements and Data Types

Program Element

Program Type

Program Input Parameters

Simulation Schema Data Types and Elements

Simulation Element

Simulation Type

Simulation Characterization Axis

SimulationRun

Snapshot

Snapshot Characterization