https://www.php.net/manual/it/function.xml-set-notation-decl-handler.php
PHP: xml_set_notation_decl_handler - Manual
Valorizza il gestore delle dichiarazione delle notazioni
set notationphpxmldeclhandler
https://www.w3schools.com/PhP/func_xml_set_notation_decl_handler.asp
PHP xml_set_notation_decl_handler() Function
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set notationphpxmldeclhandler