Seems XML::Simple cannot be used for XML from untrusted source (see here
Looking for some way to pre-process/validate XML to make sure that XXE is not used there, before feeding it to XML::Simple, and it's ok for me to use another XML module for that purpose (The other possible way to drop XML::Simple and just use that another module, but I don't want to rewrite whole code to use new API/data structures).
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