code: public static <T> ElementDescriptor<T> register(QualifiedName qname, IObjectBuilder<T> builder)
  	{
  		return register(qname, builder, DEFAULT_CONTEXT);
  	}
docs: Register an element with the given {@link QualifiedName} using the given {@link IObjectBuilder} in the default {@link XmlContext}.
  
  @param qname
  The {@link QualifiedName} of the element.
  @param builder
  The {@link IObjectBuilder} to build and serialize this element.
  @return The {@link ElementDescriptor}.