Using an XML sitemap you can inform search engines about which pages should be crawled within a web page. In its simplest form, a sitemap is an XML file where all URLs are listed, which are to be found by the search engine. A big advantage of such a sitemap is that the URLs contained may be provided with additional metadata for each URL.

So you can send the search engine, for example, which pages contain important information and priority. This is an optional tag. The value contained in this day stands in relation to the relevance of the other pages, allowing the search engines to crawl the site based on these priority guidelines.

Further information can be transmitted in time to the search engine, what are two other tags: changefreq and lastmod. Lastmod tells the search engine, when the site has experienced the last change, changefreq indicates how often the contents of the corresponding page usually changes.

With an XML Sitemap to the search engine bot can be told in addition that, besides the directly accessible pages still exist more pages that the bot will not be reached without further notice. If one uses an XML sitemap to make such sites accessible to the search engine, you should always think about the site architecture. The goal of a good architecture is to make every single page of a search engine crawlable, so that an XML sitemap for these purposes is not “misused” it must be ..

Are not to despise the information you get when you use a site map and are registered with Google Webmaster Central. So you can learn, for example, how many times you crawled your site map in a given period, how many pages were affected and how long has this crawl, which can help you with performance optimizations.

For more information about XML sitemaps you can find on Google.

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