在模板中有以下代码，portal:articles应该是自定义的标签，但是我不知道<widget name="last_articles">这是什么意思，应该怎么用，是在哪里定义的这个标签？

            <widget name="last_articles">
                <div class="tc-box">
                    <div class="headtitle">
                        <h2>{$widget.title}</h2>
                    </div>
                    <div class="posts">
                        <portal:articles limit="5" order="post.published_time DESC"
                                         categoryIds="$widget.vars.last_articles_category_id">
                            <dl class="dl-horizontal">
                                <dt>
                                    <a class="img-wraper"
                                       href="{:cmf_url('portal/Article/index',array('id'=>$vo.id))}">
                                        <if condition="empty($vo.more.thumbnail)">
                                            <img src="__TMPL__/public/assets/images/default_tupian4.png"
                                                 class="img-responsive" alt="{$vo.post_title}"/>
                                            <else/>
                                            <img src="{:cmf_get_image_url($vo.more.thumbnail)}"
                                                 class="img-responsive" alt="{$vo.post_title}"/>
                                        </if>
                                    </a>
                                </dt>
                                <dd>
                                    <a href="{:cmf_url('portal/Article/index',array('id'=>$vo['id']))}">{$vo.post_title}</a>
                                </dd>
                            </dl>
                        </portal:articles>
                    </div>
                </div>
            </widget>

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