$c= new LogConfiguration(new Properties('log.ini'));
$cat= $c->category('default');   // Returns console, syslog and files
$cat= $c->category('syslog');    // An appender as configured by "syslog"

$all= $c->categories();  // ["default" => new LogCategory()->withAppenders(...), "syslog" => ...

$name= 'does-not-exist';
$exists= $c->provides($name);    // FALSE
$cat= $c->category($name);       // ***lang.IllegalArgumentException***