ds-site/Resources/Private/Templates/Sitemaps/RssFeed.xml

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <f:if condition="{settings.categoryId}">
            <f:then>
                <title>Daniel Siepmann - Coding is Art - Blog Posts {settings.categoryTitle}</title>
                <description>List of {settings.categoryTitle} blog posts at daniel-siepmann.de</description>
                <link>{f:uri.typolink(parameter: 't3://page?uid=11', additionalParams: '&topic_uid={settings.categoryId}', absolute: 1)}</link>
                <atom:link href="{f:uri.typolink(parameter: 't3://page?uid=1&type=1533906435', additionalParams: '&sitemap=blog-posts&category_uid={settings.categoryId}', absolute: 1)}" rel="self" type="application/rss+xml" />
            </f:then>
            <f:else>
                <title>Daniel Siepmann - Coding is Art - All Blog Posts</title>
                <description>List of blog posts at daniel-siepmann.de</description>
                <link>{f:uri.typolink(parameter: 't3://page?uid=1', absolute: 1)}</link>
                <atom:link href="{f:uri.typolink(parameter: 't3://page?uid=1&type=1533906435', additionalParams: '&sitemap=blog-posts', absolute: 1)}" rel="self" type="application/rss+xml" />
            </f:else>
        </f:if>
        <lastBuildDate>{f:format.date(date: 'now', format: 'D, d M Y H:i:s O')}</lastBuildDate>
        <ttl>1800</ttl>

        <f:for each="{items}" as="item">
            <f:if condition="{item.data.doktype} < 200">
                {f:render(section: 'Item', arguments: {
                    item: item.data,
                    description: item.description
                })}
            </f:if>
        </f:for>
    </channel>
</rss>

<f:section name="Item">
    <item>
        <title>{item.title}</title>
        <description>{description -> f:format.cdata()}</description>
        <link>{f:uri.typolink(parameter: 't3://page?uid={item.uid}', absolute: 1)}</link>
        <pubDate>{f:format.date(date: item.lastUpdated, format: 'D, d M Y H:i:s O')}</pubDate>
        <guid isPermaLink="true">{f:uri.typolink(parameter: 't3://page?uid={item.uid}', absolute: 1)}</guid>
    </item>
</f:section>