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ResourceSet resourceSet = new ResourceSetImpl(); 
URI fileURI = 
    URI.createFileURI(new File("mypo.xml").getAbsolutePath()); 
Resource poResource = resourceSet.createResource(fileURI); 
poResource.getContents().add(aPurchaseOrder); 
poResource.save(null); 

ResourceSet resourceSet = new ResourceSetImpl(); 
URI fileURI = 
    URI.createFileURI(new File("mypo.xml").getAbsolutePath()); 
Resource poResource = resourceSet.getResource(fileURI, true); 
PurchaseOrder aPurchaseOrder = 
    (PurchaseOrder)poResource.getContents().get(0);