This is a simple virtual class that is used as a base class of R class definitions corresponding to data types defined in XML schema. The idea is that we can then define general methods, e.g. documentation, for these classes and instances with a single method that dispatches on this class. Essentially this class is a label with no fields.
When one creates the classes, a different base class can be specified.
It can extend this or replace it. For example, one might want to use
a class name that identifies the context of the schema, e.g. KEGG or NOAA.
One might then define a class with
setClass("NOAASchemaClass", contains = "VirtualXMLSchemaClass")
to inherit any general methods for
but to provide the opportunity of identifying the source/context of the
A virtual Class: No objects may be created from it.
No methods defined with class "VirtualXMLSchemaClass" in the signature.
Duncan Temple Lang
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