How to maintain a consistent XPath for each field?

More help, please 🙂
While working with the generated XFDF, I intended to extract the XPath for each field. However, I realized that the unique path for each field might be affected by the number of fields already filled.

For instance:

Initially, the XPath for a field named "3 activities" appears as:
/xfdf[@xmlns="http://ns.adobe.com/xfdf/"]/fields/field[6]/field[4]//field[7]@4326092 

However, when I fill another field, the XPath changes to:
/xfdf[@xmlns="http://ns.adobe.com/xfdf/"]/fields/field[6]/field[4]//field[11]@4326092  

How can I maintain a consistent XPath for each field?

Thank you so much