International Virtual Observatory Alliance
The architecture of the second generation data access layer (DAL) family of services is described, including the role of closely related standards such as data models and grid and web services. In particular the role of the Generic Dataset (GDS) as the root class of the DAL service hierarchy is described.
This is an IVOA Note expressing suggestions from and opinions of the authors.
It is intended to share best practices, possible approaches, or other perspectives on interoperability with the Virtual Observatory. It should not be referenced or otherwise interpreted as a standard specification.