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Sitemap index tags

  04/08/07 00:58, by , Categories: Specs

<sitemapindex>

required

Encapsulates information about all of the Sitemaps in the file.

<sitemap>

required

Encapsulates information about an individual Sitemap.

<loc>

required

Identifies the location of the Sitemap.

This location can be a Sitemap, an Atom file, RSS file or a simple text file.

<lastmod>

optional

Identifies the time that the corresponding Sitemap file was modified. It does not correspond to the time that any of the pages listed in that Sitemap were changed. The value for the lastmod tag should be in W3C Datetime format.

By providing the last modification timestamp, you enable search engine crawlers to retrieve only a subset of the Sitemaps in the index i.e. a crawler may only retrieve Sitemaps that were modified since a certain date. This incremental Sitemap fetching mechanism allows for the rapid discovery of new URLs on very large sites.

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