之前用的sitemap插件中是没有分类和标签的，为了方便seo，在sitemap中添加分类和标签，代码如下：

<?php
class Sitemap_Action extends Typecho_Widget implements Widget_Interface_Do
{
    public function action()
    {
        $db = Typecho_Db::get();
        $options = Typecho_Widget::widget('Widget_Options');

        $pages = $db->fetchAll($db->select()->from('table.contents')
        ->where('table.contents.status = ?', 'publish')
        ->where('table.contents.created < ?', $options->gmtTime)
        ->where('table.contents.type = ?', 'page')
        ->order('table.contents.created', Typecho_Db::SORT_DESC));
        
        $cates = $db->fetchAll($db->select()->from('table.metas')
        ->where('table.metas.type = ?', 'category')
        ->order('table.metas.order', Typecho_Db::SORT_DESC));
        
        $tags = $db->fetchAll($db->select()->from('table.metas')
        ->where('table.metas.type = ?', 'tag')
        ->order('table.metas.count', Typecho_Db::SORT_ASC));

        $articles = $db->fetchAll($db->select()->from('table.contents')
        ->where('table.contents.status = ?', 'publish')
        ->where('table.contents.created < ?', $options->gmtTime)
        ->where('table.contents.type = ?', 'post')
        ->order('table.contents.created', Typecho_Db::SORT_DESC));

        header("Content-Type: application/xml");
        echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
        echo "<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\n";
        foreach($articles AS $article) {
            $type = $article['type'];
            $article['categories'] = $db->fetchAll($db->select()->from('table.metas')
                    ->join('table.relationships', 'table.relationships.mid = table.metas.mid')
                    ->where('table.relationships.cid = ?', $article['cid'])
                    ->where('table.metas.type = ?', 'category')
                    ->order('table.metas.order', Typecho_Db::SORT_ASC));
            $article['category'] = urlencode(current(Typecho_Common::arrayFlatten($article['categories'], 'slug')));
            $routeExists = (NULL != Typecho_Router::get($type));
            $article['pathinfo'] = $routeExists ? Typecho_Router::url($type, $article) : '#';
            $article['permalink'] = Typecho_Common::url($article['pathinfo'], $options->index);

            echo "\t<url>\n";
            echo "\t\t<loc>".$article['permalink']."</loc>\n";
            echo "\t\t<lastmod>".date('Y-m-d\TH:i:s\Z',$article['modified'])."</lastmod>\n";
            echo "\t\t<changefreq>always</changefreq>\n";
            echo "\t\t<priority>0.8</priority>\n";
            echo "\t</url>\n";
        }        
        foreach($pages AS $page) {
            $type = $page['type'];
            $routeExists = (NULL != Typecho_Router::get($type));
            $page['pathinfo'] = $routeExists ? Typecho_Router::url($type, $page) : '#';
            $page['permalink'] = Typecho_Common::url($page['pathinfo'], $options->index);

            echo "\t<url>\n";
            echo "\t\t<loc>".$page['permalink']."</loc>\n";
            echo "\t\t<lastmod>".date('Y-m-d\TH:i:s\Z',$page['modified'])."</lastmod>\n";
            echo "\t\t<changefreq>always</changefreq>\n";
            echo "\t\t<priority>0.8</priority>\n";
            echo "\t</url>\n";
        }
        foreach($tags AS $tag) {
            $type = $tag['type'];
            $routeExists = (NULL != Typecho_Router::get($type));
            $tag['pathinfo'] = $routeExists ? Typecho_Router::url($type, $tag) : '#';
            $tag['permalink'] = Typecho_Common::url($tag['pathinfo'], $options->index);

            echo "\t<url>\n";
            echo "\t\t<loc>".$tag['permalink']."</loc>\n";
            //echo "\t\t<lastmod>".date('Y-m-d\TH:i:s\Z',time())."</lastmod>\n";
            echo "\t\t<changefreq>always</changefreq>\n";
            echo "\t\t<priority>0.4</priority>\n";
            echo "\t</url>\n";
        }
        foreach($cates AS $cate) {
            $type = $cate['type'];
            $art_rs = $db->fetchRow($db->select()->from('table.contents')
                    ->join('table.relationships', 'table.contents.cid = table.relationships.cid')
                    ->where('table.contents.status = ?', 'publish')
                    ->where('table.relationships.mid = ?', $cate['mid'])
                    ->order('table.relationships.cid', Typecho_Db::SORT_DESC)
                    ->limit(1));
            $routeExists = (NULL != Typecho_Router::get($type));
            $cate['pathinfo'] = $routeExists ? Typecho_Router::url($type, $cate) : '#';
            $cate['permalink'] = Typecho_Common::url($cate['pathinfo'], $options->index);

            echo "\t<url>\n";
            echo "\t\t<loc>".$cate['permalink']."</loc>\n";
            echo "\t\t<lastmod>".date('Y-m-d\TH:i:s\Z',$art_rs['modified'])."</lastmod>\n";
            echo "\t\t<changefreq>always</changefreq>\n";
            echo "\t\t<priority>0.5</priority>\n";
            echo "\t</url>\n";
        }
        echo "</urlset>";
    }
}

替换原sitemap中action文件代码即可。

但是这样会出现一个问题，如果你采用了定时发布，post是不会出现在sitemap中的，但是tag是会出现的，只是tag修改的时间会比较久远。如果你需要使用定时发布，还是建议将tag相关代码注释掉！正常发布的话是没有任何问题的！