<?php

class HelloWorld {

    public function hello($name) {
        return "Hello ".$name."!";
    }

}
----
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:phpmae="coid://phpmae.dev/">

    <phpmae:Class rdf:about="coid://playground.phpmae/HelloWorld">
    </phpmae:Class>

</rdf:RDF>