Yours is a good idea, but unfortunately I can't change the xml files.
However, giving a look at the xml, I noticed that the label names are unique and I can add these names as properties of the QLineEdit widgets
Qt Code: 
  1. QLineEdit::setProperty("id", labelName);
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Then, I can use the labelName as information to retrieve the correct modified tag (even if I don't know how yet). It is the first time that I work with xml files