A recent discussion made me aware that the documentation on DataType classes is excellent.
http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=...
I just miss the visualization of the methods for Data Format Conversions.
LogicalToDisplay() / DisplayToLogical()
LogicalToOdbc() / OdbcToLogical()
LogicalToStorage() / StorageToLogical()
LogicalToXSD() / XSDToLogical()
Graphic makes it much easier to understand for anyone beginning with Caché objects.