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in Italy electronic invoicing has existed for years, they have practically inserted the invoice in all its forms in an xlm file but this needs another file where the style is stored, generally two types of style are associated, one such as a small page with all the data and an invoice type in graphic ...

Hola.
Quiero detectar si el archivo que me está intentando cargar un cliente es un XML, como puedo hacerlo (sin solamente ver si la extension es .xlm)?

gracias.