"variable" nodes; these are outside the RDF2003 specification, but are
used internally for "placeholder" nodes where blank nodes would be
wrong, most specifically in Query.
author: kers
Inner Class :public static class VariableName
Constructor Summary
protected
Node_Variable(Object name) Initialise this Node_Variable with a name object (which should be a
VariableName object).
public
Node_Variable(String name) Initialise this Node_Variable from a string name,
which becomes wrapped in a VariableName.