ds-site/Configuration/TypoScript/Setup/RssFeed.typoscript

page {
    headerData {
        10 = TEXT
        10 {
            wrap = <link rel="alternate" title="RSS Feed of all blog posts" type="application/rss+xml" href="|" />
            typolink {
                parameter = t3://page?uid=1
                additionalParams = &type=1707321482&feed=blog-posts
                returnLast = url
            }
        }
        11 = COA
        11 {
            if {
                isTrue.stdWrap.data = GP:topic_uid
            }
            1 = TEXT
            1.char = 10
            2 = TEXT
            2 {
                noTrimWrap = |<link rel="alternate" title="RSS Feed of blog posts for topic: |" type="application/rss+xml"|
                data.dataWrap = DB : sys_category:{GP:topic_uid}:title
            }
            3 = TEXT
            3.char = 32
            4 = TEXT
            4 {
                wrap = href="|" />
                typolink {
                    parameter = t3://page?uid=1
                    additionalParams.stdWrap.cObject = COA
                    additionalParams.stdWrap.cObject {
                        10 = TEXT
                        10.value = &type=1707321482&feed=blog-posts
                        11 = TEXT
                        11.value = &category_uid=
                        12 = TEXT
                        // uid is casted to int within PHP source
                        12.data.dataWrap = DB : sys_category:{GP:topic_uid}:uid
                    }
                    returnLast = url
                }
            }
        }
    }
}
rssFeed = PAGE
rssFeed {
    typeNum = 1707321482

    config {
        admPanel = 0
        debug = 0
        disableAllHeaderCode = 1
        additionalHeaders {
            10 {
                header = Content-Type: application/xml;charset=utf-8
            }
        }
    }

    10 = FLUIDTEMPLATE
    10 {
        dataProcessing {
            10 = DanielSiepmann\DsSite\Frontend\RssFeed\BlogPostsDataProvider
            10 {
                as = pages
                table = pages
                orderBy = lastUpdated DESC
                selectFields = pages.uid, pages.abstract, pages.title, pages.lastUpdated
                where = AND no_index = 0
                pidInList = {$pageUids.blogPosts}
                recursive = 3
            }
        }

        variables {
            categoryId = TEXT
            categoryId.data = GP:category_uid
            categoryId.intval = 1
            categoryTitle = TEXT
            categoryTitle.data.dataWrap = DB : sys_category:{GP:category_uid}:title
        }

        file = EXT:ds_site/Resources/Private/Templates/RssFeed.xml
    }
}