ANN: How to design an XML Schema component into which other components can be embedded

Hi Folks,

I have found that a common XML Schema design problem is: 

      How do I design an XML Schema for a component 
      into which I can embed other components? 

In this document I show 4 approaches to solving the problem:

http://www.xfront.com/Embedding-Various-Components-into-an-XML-Component.docx 

/Roger