This module sends processing instructions, comments, DTDs and a non predefined entity (defined by the DTD) to the requesting entity.
Send “PI”, “comment”, “DTD” or “entity” to xmpp:example.com/conformance, while directly connected to the Prosody instance.
With the plugin installer in Prosody 0.12 you can use:
sudo prosodyctl install https://modules.prosody.im/rocks/mod_conformance_restricted-3-1.src.rock
For other see the documentation for installing 3rd party modules