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XML Sitemaps — Structure, Splitting, and Submission

When to split sitemaps, index sitemaps, lastmod accuracy, image and video extensions, hreflang in sitemaps. With validation checklist.

By Mike Technical SEO Consultant

2026-05-21 · 10 min

Full article publishes in the next 1-2 weeks. Below is the outline this article will cover.

Overview

When to split sitemaps, index sitemaps, lastmod accuracy, image and video extensions, hreflang in sitemaps. With validation checklist.

Topics covered

xml sitemap
sitemap index
sitemap submission
dynamic sitemap
sitemap lastmod

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In plain English: Deep-dive on xml sitemap best practices. If you need this fixed on your own site, send the URL and you'll get a Loom walkthrough back within 48 hours.