...
The ODM element is the top-level (root) element of each ODM document.
Remark that the Note: The whole document (but essentially each extensible element within the ODM document) can be signed off through an electronic signature (e.g., XAdES) by adding a therefore suitable element as last element, like such as ds:Signature in the namespace "http://www.w3.org/2000/09/xmldsig#"
...