Proposal for change to VOTable schema

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Proposal for change to VOTable schema

• Without changing set of valid documents (modulo
  undesired ones)
• http//www.ivoa.net/forum/votable/0504/0748.htm

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Motivation

• Reuse of certain, but not all constructs (FIELD)
• Validates easier (ltTD/gt currently valid)
• OO motivation (see dm session)
• Similar change accepted in registry group,
  hopefully in dm.
• Cleaner design (simpler, example XMLBeans)

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(No Transcript)
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Changes

• No element ref construct.
• No global elements for attributes and contained
  classes.
• Analogy to Java binding
• Complex type ltgt class
• Typed ltelementgt declarations ltgt Fields in class
  definition
• Default document ltgt a main method using the
  classes.
• Global elements ltgt variable declarations local
  to main method
• Single inheritance mapping, only extension, no
  substitutionGroupRequires xsitype construct to
  indicate which precise class is used.
• Can support a more involved special purpose
  document to/from the official default registry
  document using XSLT scripts for example (view
  concept).
• See also http//www.xml.com/pub/a/2002/08/07/wxs_
  uml.html and others
• Probably more
• VOTable redesign

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• ltxscomplexType name"Data"gt
• ltxschoicegt
•   ltxselement
• name"TABLEDATA"
• type"TableData" /gt
•   ltxselement name"BINARY"
• type"Binary"/gt
•   ltxselement name"FITS"
• type"Fits" /gt
•   lt/xschoicegt
•   lt/xscomplexTypegt

• ltxscomplexType name"Data abstracttrue/gt
• ltxscomplexType nameTabledata/gt
• ltxscomplexContent
• ltxsextension baseDatagt
• ...
• ltTABLEgt. ltDATA xsitype"TableData"gt...
  lt/DATAgt
• lt/TABLEgt