Lon Xml Tool
The Lon Xml Tool is available from the Tools menu. The Lon Xml Create view helps you make your own Lon Xml (.lnml) file for a device, using the source .xif file and (if necessary) other resource files, as available from the device’s manufacturer. The tool’s window provides the necessary input fields.

Refer to the Lonworks Guide for details about using this view and about the following:
Need for custom Lon Xml files
Lon Xml file overview
Lon Xml creation
Storing .lnml files
Differential temperatures and lnml file edits