Spectral v2.0 Proposed Recommendation: Request for Comments

This page records the public discussion for round 2 of the Spectral2.0 Data Model Proposed Recommendation. The initial pass went through RFC to TCG where it received significant input. These were addressed, and it was decided that the document should pass through RFC again.

Initial RFC/TCG review comments can be found here:

• http://wiki.ivoa.net/twiki/bin/view/IVOA/Spectral2RFC

Latest version of Spectral2.0 can be found at:

• PR-SpectralDM-2.0-20150528

NOTE: No new capabilities have been added to the document over what was presented at the IVOA interop in Sesto. The intent is that this document fulfills the requirements of its commissioning. A new project will be initiated to expand the capabilities for unsupported types (eg: Echelle spectra), and to cast the model in terms of the DatasetMetadata/CubeDM models now in progress.

Reference Interoperable Implementations

1) Speclib Java library: can be found here.

Java library for interpreting Spectral-2.0 model serializations.

• loads model definition from ancillary file, with design capable of supporting alternate storage mechanisms (DB, vo-dml, etc)
• interprets data file according to the model definition.
• implements interfaces for model components, supports all primitive datatypes, Quantity, Lists which are used in the Spectral model Note: This library is a work in progress, and is being updated to include:
• support for multiple data models ( Spectrum-1.1; Dataset; NDCube; etc )
• enhanced validation capabilities

2) Serializations utilizing Spectral 2.0 model specifications

• GAVO: GAVO DC Software Distribution DaCHS
• SVO: TSAP - Theorical Spectral Model Service (Not available?)

3) Interoperability demo

A demonstration utility (speclist) was generated and demonstrated at the Sesto interop. This utility queries the GAVO database for spectral data and generates a simple plot with metadata browser. Users can explore the metadata space, and zoom on plot details.

Implementations Validators

At present, the speclib library is not ready to support 'validation', but is fairly strict in the interpretation of serializations in terms of the data model. Issues and non-compliant elements will produce exceptions or be interpreted as custom elements.

RFC Review Period: 21 Sep 2015 - 16 Oct 2015

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Comments from the IVOA Community during RFC period: 21 Sep 2015 - 16 Oct 2015

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