@Luca-Andrea-Ludovico said in XML Tools - Validation problem with inline DTD:
Now I have just updated the plug-in to version 3.0.4.2, and it seems not working anymore: it asks for an XML schema (XSD). The dialog says:
I would open an issue at the XML Tools Github issue tracker if you haven’t done so already. Also, provide a link to this thread in your issue there.
I’ve had no experience interacting with that developer directly, but there have been a flurry of XML Tools updates in the past few months as it seems he migrated to a new XML engine (Replacement of libXML with MSXML) back in January this year (according to Github commits). Since January 2020, there have been 14 new release (counting the latest pre-release). He certainly seems active and committed to the project - and thankfully, since I use XML Tools plugin as well, although maybe not to the degree you are.
Good luck!
Cheers.