Task: RSS feed for ARD Audiothek podcasts

n8n workflow:
{"nodes":[{"id":"35c4aa9f-7535-4315-9174-fe97afc6de2e","name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[240,300],"parameters":{},"typeVersion":1},{"id":"ed1f4f78-733f-4dd5-9785-969c9ec0d637","name":"Get overview page","type":"n8n-nodes-base.httpRequest","position":[460,300],"parameters":{"url":"https://www.ardaudiothek.de/sendung/kalk-und-welk/10777871/","options":{},"responseFormat":"string"},"typeVersion":2},{"id":"28333c78-aa8f-401a-8033-2007a5e6991c","name":"Extract links","type":"n8n-nodes-base.htmlExtract","position":[680,300],"parameters":{"options":{},"extractionValues":{"values":[{"key":"links","attribute":"href","cssSelector":"a[href*=\"/episode/\"]","returnArray":true,"returnValue":"attribute"}]}},"typeVersion":1},{"id":"58840494-4208-49ce-b82a-d7cf8abd3b29","name":"Remove duplicate links","type":"n8n-nodes-base.itemLists","position":[1120,300],"parameters":{"operation":"removeDuplicates"},"typeVersion":1},{"id":"17efb905-b947-4538-ab34-d50bf7fdbd75","name":"Split out lists","type":"n8n-nodes-base.itemLists","position":[900,300],"parameters":{"options":{"destinationFieldName":"link"},"fieldToSplitOut":"links"},"typeVersion":1},{"id":"59a69e64-ebba-42cb-b8d0-8dd73f0ae962","name":"Get episode page","type":"n8n-nodes-base.httpRequest","position":[1340,300],"parameters":{"url":"=https://www.ardaudiothek.de{{ $json[\"link\"] }}","options":{},"responseFormat":"string"},"typeVersion":2},{"id":"68749bff-1499-4ef5-aefd-c4b6233d0fa7","name":"Extract script","type":"n8n-nodes-base.htmlExtract","position":[1560,300],"parameters":{"options":{},"extractionValues":{"values":[{"key":"script","cssSelector":"script:nth-of-type(2)","returnValue":"html"}]}},"typeVersion":1},{"id":"158e7b18-f58d-453f-80f8-97e65f0b1fde","name":"Parse JSON","type":"n8n-nodes-base.set","position":[1780,300],"parameters":{"values":{"string":[{"name":"data","value":"={{ JSON.parse($json.script) }}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"id":"a613c52e-395b-4d88-ab7d-b1cf2b664b43","name":"Define feed items","type":"n8n-nodes-base.function","position":[2000,300],"parameters":{"functionCode":"const escapeHTML = str => str.replace(/[&<>'\"]/g, \n  tag => ({\n      '&': '&amp;',\n      '<': '&lt;',\n      '>': '&gt;',\n      \"'\": '&#39;',\n      '\"': '&quot;'\n    }[tag]));\n\nlet feedItems = [];\nfor (item of items) {\n  feedItems.push(`<item>\n  <title>${escapeHTML(item.json.data.name)}</title>\n  <enclosure url=\"${item.json.data.associatedMedia.contentUrl}\" length=\"${item.json.data.timeRequired * 20 * 1000}\" type=\"${item.json.data.encodingFormat}\"/>\n  <guid isPermaLink=\"false\">${item.json.data.identifier}</guid>\n  <pubDate>${DateTime.fromISO(item.json.data.datePublished).toRFC2822()}</pubDate>\n  <description>${escapeHTML(item.json.data.description)}</description>\n</item>`);\n}\n\nreturn [{\n  data: `<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<rss version=\"2.0\" xmlns:itunes=\"http://www.itunes.com/dtds/podcast-1.0.dtd\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">\n  <channel>\n    <title>${escapeHTML(items[0].json.data.partOfSeries.name)}</title>\n    <description>${escapeHTML(items[0].json.data.partOfSeries.about)}</description>\n    <itunes:image href=\"${escapeHTML(items[0].json.data.image)}\" />\n    <language>${items[0].json.data.inLanguage}</language>\n    <itunes:category text=\"Comedy\" />\n    <itunes:explicit>no</itunes:explicit>\n    <link>${items[0].json.data.partOfSeries.url}</link>\n    <copyright>© ${$now.toFormat('yyyy')} ${escapeHTML(items[0].json.data.productionCompany)}</copyright>\n    <itunes:author>${escapeHTML(items[0].json.data.productionCompany)}</itunes:author>\n    ${feedItems.join('\\n')}\n  </channel>\n</rss>\n`\n}];\n"},"typeVersion":1},{"id":"cbdc367d-a685-4f0b-a9f3-0aedc2c8b3c1","name":"Feed","type":"n8n-nodes-base.webhook","position":[240,100],"webhookId":"3fbd94de-2fb3-4b32-a46e-c237865479b9","parameters":{"path":"3fbd94de-2fb3-4b32-a46e-c237865479b9.rss","options":{},"responseMode":"responseNode"},"typeVersion":1},{"id":"0dfb02cc-1944-4542-b5c5-9e0b198e143d","name":"Serve feed","type":"n8n-nodes-base.respondToWebhook","position":[2220,300],"parameters":{"options":{"responseCode":200,"responseHeaders":{"entries":[{"name":"Content-Type","value":"application/rss+xml"}]}},"respondWith":"text","responseBody":"={{ $json[\"data\"] }}"},"typeVersion":1}],"connections":{"Feed":{"main":[[{"node":"Get overview page","type":"main","index":0}]]},"Parse JSON":{"main":[[{"node":"Define feed items","type":"main","index":0}]]},"Extract links":{"main":[[{"node":"Split out lists","type":"main","index":0}]]},"Extract script":{"main":[[{"node":"Parse JSON","type":"main","index":0}]]},"Split out lists":{"main":[[{"node":"Remove duplicate links","type":"main","index":0}]]},"Get episode page":{"main":[[{"node":"Extract script","type":"main","index":0}]]},"Define feed items":{"main":[[{"node":"Serve feed","type":"main","index":0}]]},"Get overview page":{"main":[[{"node":"Extract links","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Get overview page","type":"main","index":0}]]},"Remove duplicate links":{"main":[[{"node":"Get episode page","type":"main","index":0}]]}}}