In ixml, you can define a rule that generates an XML element in your output based on the absence of characters.
Section 2.6.1 explicitly warns about the danger of creating infinite loops. If you have a rule that can "match nothing" and repeat indefinitely, the parser will get stuck trying to output infinite empty elements.
Unlike Tor (which relies on centralized directory authorities), I2P is a true "mesh" network where every router shares the load of routing traffic for others.
🛡️ Option 1: Invisible 2.6.1 for macOS (The File Hider)