<H1> DM work package : Utypes definition and syntax </H1> <br/> %PUBURL%/%TWIKIWEB%/TWikiDocGraphics/wip.gif Site under re construction %PUBURL%/%TWIKIWEB%/TWikiDocGraphics/wip.gif *This topic is under the Data model pages but also addressed in the TCG Topic page : http://www.ivoa.net/cgi-bin/twiki/bin/view/IVOA/TCGTopicsUtypes ---+++ What are Utypes for Utypes are strings that we define in the VO to be able to represent and identify which role plays a specific piece of metadata %BR% Ex: =astrometry statistical error = 0.02 arcsec= can be represented in the VO by : ==char:Spatial.Accuracy.StatError.Refval== %BR% and verified by the XML schema derived from the Characterisation Data Model . ---+++ How can I find which Utype is relevant for my data collection 1 Select an IVOA data model to which you want to be compliant . _Ex : Characterisation Data Model_ 1 Browse the Utype list and its documentation to select the appropriate Utype for your metadata description _Ex : for a Fits image : FITS keyword RESOL to map Spatial.Resolution.RefVal Characterisation Data Model _ for a Fits simple spectrum : FITS keyword SPECRES to map Spectral.Resolution.RefVal 1 Check wether all mandatory Utypes are filled in . If you publish your data with Characterisation , you can use the CAMEA VO Tool (http://eurovotech.org/twiki/bin/view/VOTech/CharacEditorTool) to check the Utype assignation, and see how much your description is Characterisation DM compliant. <br/> <!-- * Set ALLOWTOPICRENAME = %MAINWEB%.TWikiAdminGroup -->
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2007-01-28 - 13:51
NormanGray
Draft Note on UTypes
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Topic revision: r3 - 2008-06-11 - MireilleLouys
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