Technical SEO
Sitemap index
A sitemap index is an XML file that lists the locations of multiple sitemap files rather than listing page URLs directly.
What it means
It uses a sitemapindex root with sitemap entries containing an absolute loc and optional lastmod for the child file. A sitemap index can reference up to the protocol limit, and each child sitemap retains its own URL and size limits.
Why it matters
Splitting a large or multi-type inventory into child sitemaps makes generation, Monitoring and Search Console diagnosis easier. A valid top-level index is still ineffective when child files fail, redirect unexpectedly or contain non-canonical URLs.
Example
A store publishes separate product, category and article sitemaps and lists their absolute URLs in one index. The generator changes the product sitemap lastmod only when that child file changes, and Monitoring fetches both the index and every child.
Common mistakes
Do not place page URLs directly inside a sitemap index, confuse child-file lastmod with page modification dates or list missing and redirected sitemap files. Avoid creating multiple competing generators that publish inconsistent indexes.
How AYSA handles this
Signals reviewed
Index XML, child sitemap locations, child responses, protocol validation, lastmod consistency
Problem AYSA can identify
AYSA can find missing, redirected, invalid or competing child sitemaps and index entries whose timestamps are not trustworthy.
Recommendation prepared
The proposal specifies the authoritative index, child grouping and exact entries to add, correct or remove.
Approval preview
The user reviews the current index tree, responses and proposed child-file inventory before supported changes.
Execution
AYSA can update supported WordPress sitemap configuration; external generators, servers and CDN routes require their native controls.
Verification
AYSA refetches the index and every child, validates the XML structure and compares child URLs with the approved sitemap inventory.
Limits
A valid index improves discovery and monitoring but does not guarantee crawling or indexation of listed pages.
Sources and further reading
- Google Search Central — Build and submit a sitemap — Official platform documentation
- Sitemaps.org — Sitemap protocol — Technical standard
Written by Marius Dosinescu. Reviewed by AYSA SEO Editorial Team · 2026-07-28 00:00:00.
Quick answers
Frequently asked questions
Does a sitemap index list page URLs directly?
No. It lists child sitemap files. The individual child sitemaps contain the page or resource URLs.
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