If you can find a single example of such a document
Already been done. Say I want to output <db_select><&lab;</db_select> from a plugin I'm writing for other people to use. I can't.
I can't output <db_select> because it could interfere with another plugin.
I can't use <post_include>, because I have no idea where the plugin's user stores his templates.
And now I can't even use &lab; to mean "<" anymore because you just said it relies on other plugins that may or may be in use. If you misspoke and I can still use &lab; to mean "<", then I'm not able to output "&lab;".
As far as I can tell in 5 years of writing aXML documents specifying various complex systems,
Perl has 1000s of bugs in its RT system, yet people use Perl every day. That doesn't mean the bugs don't exist, and it doesn't mean they're not serious.
By the way, it's really stupid to try (but fail) to fix a bug then claim it doesn't exist.
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