Attribute(XmlReader reader)  at System.Data.EntityModel.SchemaObjectModel.Schema.HandleAttribute(XmlReader reader)  at System.Data.EntityModel.SchemaObjectModel.SchemaElement.ParseAttribute(XmlReader reader)  at System.Data.EntityModel.SchemaObjectModel.SchemaElement.Parse(XmlReader reader)  at System.Data.EntityModel.SchemaObjectModel.Schema.Handle