GAVO's ADQL reference card briefly gives an overview of the SQL
dialect used in the VO. It is available as a PDFfile and as Scribus
source under the CC-BY license.
This draft standard describes a means to present usage examples for
TAP services in a way that is partially machine readable while
primarily being consumable by humans. This is now part of DALI;
identifiers created as fragments into this record are invalid and must
now point to fragments of http://www.ivoa.net/rdf/examples.
The publication software DaCHS comes with a preconfigured authority
x-unregistred. Before version 2.3, it would let records with this null
authority into the VO. This authority's exclusive purpose is to let us
delete any such records.