The Role of the SITEMAP-INDEX in Web Architecture

A SITEMAP-INDEX serves as a master directory for websites that possess a vast number of pages. According to the Sitemaps.org protocol, any single SITEMAP is restricted to 50,000 URLs or 50MB in size. To circumvent these limitations, developers implement a SITEMAP-INDEX to point SEARCH-ENGINE bots toward multiple individual sitemap files.

For platforms relying heavily on SEARCH-ENGINE-OPTIMIZATION, such as E-COMMERCE sites or large DATABASE driven portals, the index file is critical. It allows tools like GOOGLE-SEARCH-CONSOLE and BING-WEBMASTER-TOOLS to efficiently map the site's INFORMATION-ARCHITECTURE. Instead of submitting dozens of individual files, the administrator submits one SITEMAP-INDEX.

Technically, the index file uses the <sitemapindex> tag as its root, containing several <sitemap> nodes. Each node includes a <loc> tag specifying the URL of a sub-sitemap. As noted by Google Search Central, using an index is the best practice for managing large-scale CRAWLING budgets.

• XML-SITEMAP
• ROBOTS-TXT
• SEARCH-ENGINE-OPTIMIZATION
• CRAWLING-AND-INDEXING