1. Get parent node tag only if it exists

    Hi everyone, I'am struggling with something. I have a xml file where there are 2 invoices. For each invoice there is a SHAN tag. There is also a tag MSG0809_DS01_ID263 taht is in the 1st invoice, but not the second. It looks like this: <R574256A> <Numero_de_Facture_LBH_DOC_S6> ...