    <span class="phpdocumentor-element-found-in__line">126</span>
</aside>

        <p class="phpdocumentor-summary">NOTE: implement in sub-classes.</p>

    <code class="phpdocumentor-code phpdocumentor-signature ">
    <span class="phpdocumentor-signature__visibility">protected</span>
                <span class="phpdocumentor-signature__name">_validate</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span 