src/Facebook/InstantArticles/Elements/ListElement.php [167:200]:
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        if ($this->items) {
            foreach ($this->items as $item) {
                Element::appendChild($element, $item, $document);
            }
        }

        return $element;
    }

    /**
     * Overrides the Element::isValid().
     *
     * @see Element::isValid().
     * @return true for valid ListElement that contains at least one ListItem's valid, false otherwise.
     */
    public function isValid()
    {
        foreach ($this->items as $item) {
            if ($item->isValid()) {
                return true;
            }
        }
        return false;
    }

    /**
     * Implements the ChildrenContainer::getContainerChildren().
     *
     * @see ChildrenContainer::getContainerChildren().
     * @return array of Elements contained by Image.
     */
    public function getContainerChildren()
    {
        $children = array();
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src/Facebook/InstantArticles/Elements/RelatedArticles.php [121:154]:
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        if ($this->items) {
            foreach ($this->items as $item) {
                Element::appendChild($element, $item, $document);
            }
        }

        return $element;
    }

    /**
     * Overrides the Element::isValid().
     *
     * @see Element::isValid().
     * @return true for valid RelatedArticles that contains at least one RelatedItem's valid, false otherwise.
     */
    public function isValid()
    {
        foreach ($this->items as $item) {
            if ($item->isValid()) {
                return true;
            }
        }
        return false;
    }

    /**
     * Implements the ChildrenContainer::getContainerChildren().
     *
     * @see ChildrenContainer::getContainerChildren().
     * @return array of Elements contained by Image.
     */
    public function getContainerChildren()
    {
        $children = array();
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