private void CreateEmptyEDMX()
{
//get namespace URIs
string edmxNamespaceURI = NSM.LookupNamespace("edmx");
string ssdlNamespaceURI = NSM.LookupNamespace("ssdl");
string csdlNamespaceURI = NSM.LookupNamespace("edm");
//create the basic structure of the EDMX file wrapper
XmlElement runtimeElement = _edmxDocument.CreateElement("Runtime", edmxNamespaceURI);
EDMXDocument.DocumentElement.AppendChild(runtimeElement);
XmlElement storageModels = _edmxDocument.CreateElement("StorageModels", edmxNamespaceURI);
runtimeElement.AppendChild(storageModels);
XmlElement conceptualModels = _edmxDocument.CreateElement("ConceptualModels", edmxNamespaceURI);
runtimeElement.AppendChild(conceptualModels);
XmlElement mappingsElement = _edmxDocument.CreateElement("Mappings", edmxNamespaceURI);
runtimeElement.AppendChild(mappingsElement);
XmlElement designerElement = _edmxDocument.CreateElement("Designer", edmxNamespaceURI);
EDMXDocument.DocumentElement.AppendChild(designerElement);
designerElement.GetOrCreateElement("edmx", "Diagrams", NSM);
}
