Hi, Can any body tell me , what is the equivalent of model attribute (which we use in XDR format of schema to mention whether our schema model is open or close ) in XSD format of schema ? We have a schema which we created in XDR format using XML Authority 2.1 , now when we change that in to XSD format using the same tool , we didnt get any code generated for the model attribute, and hence the XERCES1.4.1 which we are using to validate the instance document against our schema is now complaning that the schema model is closed and we cannt refer to any other elements using Namespace mechanism . Any kind of help/comment .? Thanks in advance, Chandu