How to optimize the hierarchical crawling depth of large websites through Sitemap?

When a large website has insufficient crawler crawling depth due to complex hierarchies, scientifically configuring a Sitemap can effectively guide search engine crawlers to prioritize key pages and improve the indexing efficiency of deep content. It is generally recommended to split the Sitemap by content type or website hierarchy (e.g., submitting product pages, category pages, and article pages separately) to avoid a single Sitemap being too large and affecting parsing efficiency. Core pages should be set with higher priority (e.g., `<priority>0.8-1.0</priority>`) and marked with a reasonable update frequency (e.g., `daily` for frequently updated pages) to help crawlers allocate crawling resources. At the same time, duplicate content, dead links, and low-value pages (such as tag pages and search result pages) should be excluded from the Sitemap to avoid wasting crawler budget. It is advisable to regularly audit the Sitemap crawling status through tools like Google Search Console and adjust priority settings based on crawler log analysis to ensure that deep and important pages are effectively indexed.