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Now being a bit more explicit about using xtypes iso TAPType. #26

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Now being a bit more explicit about using xtypes iso TAPType. #26

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17 changes: 9 additions & 8 deletions VODataService.tex
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Expand Up @@ -2840,6 +2840,14 @@ \subsubsection{Table Column Data Types}
VODataService deprecates the use of \xmlel{vs:TAPType}. New software
should only generate \xmlel{vs:VOTableType}s in \xmlel{tableset}s.

For database types without direct VOTable counterparts (e.g., timestamp,
point, interval), publishers should fill the \xmlel{extendedType}
attribute to the appropriate a VOTable \xmlel{xtype} as defined by DALI
\citep{2017ivoa.spec.0517D}. It was envisaged to enable the use other
extended type systems by setting \xmlel{extendedSchema} to a non-empty
value. In this version of VODataService, this is discouraged because it
would create interoperability problems when using extended types in data
discovery.

% GENERATED: !schemadoc VODataService-v1.3.xsd VOTableType
\begin{generated}
Expand Down Expand Up @@ -2917,14 +2925,7 @@ \subsubsection{Table Column Data Types}



When the actual column type is not
well matched to a VOTable data type, authors are
encouraged to use the \xmlel{extendedType} attribute to refer to
a more specific type. This will usually be a VOTable \xmlel{xtype} as
defined by DALI \citep{2017ivoa.spec.0517D}. Using different extended
type schemes is possible by setting \xmlel{extendedSchema} to a
non-empty value; data providers using this extension mechanism should
explain their schema in an IVOA Note.


\appendix

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