Usages::add

public function add($ownerId, $sourceType, $value)
{
	if (!isset($this->list[$sourceType]))
	{
		$this->list[$sourceType] = [];
	}
	$key = "{$ownerId}#{$value}";
	$this->list[$sourceType][$key] = [$ownerId, $value];
	return $this;
}