lib/Model/OrderShippingTracking.php
public function valid()
    {

        if (strlen($this->container['uri']) > 500) {
            return false;
        }
        if (strlen($this->container['number']) > 120) {
            return false;
        }
        if (strlen($this->container['carrier']) > 120) {
            return false;
        }
        return true;
    }
public function valid()
    {

        if (strlen($this->container['uri']) > 500) {
            return false;
        }
        if (strlen($this->container['number']) > 120) {
            return false;
        }
        if (strlen($this->container['carrier']) > 120) {
            return false;
        }
        return true;
    }
validate all the properties in the model
return true if all passed

@return bool True if all properties are valid