Some of the customers of our exported XML files requested that we add
to the top level element.
I tried add the following to the root class that is exported:
[XmlAttribute("schemaLocation", Namespace = System.Xml.Schema.XmlSchema.InstanceNamespace)]
public string xsiSchemaLocation = @"http:aaa.org/bbb/ccc"
to no avail.
I don't think using the NamespaceMap is appropriate and I see no other likely suspects within the LxWriterSettings