Google Inc.

Ralph Michael Keller

Narayanan Shivakumar

Sascha Benjamin Brawer

Maximilian Ibel

Elad Gil

Alan C Strohm

Feng Hu

Max Ibel

Systems and methods for scheduling documents for crawling are disclosed in which sitemap information is updated for a first website identified by a sitemap by downloading updated sitemap information for the first website and scheduling documents for crawling in accordance with the updated sitemap information for the first website. The sitemap information includes one or more sitemap indexes, where each respective sitemap index in the one or more sitemap indices includes a list of URLs corresponding to documents stored at a corresponding website in a plurality of websites, the plurality of websites including the first website, and each sitemap index in the one or more sitemap indexes includes information identifying one or more of: a last modification date of a URL in the list of URLs, a change frequency of a document specified by the URL, a document title, an authority of the document, and a priority of the document.

Web crawler scheduler that utilizes sitemaps from websites

Systems and methods for scheduling documents for crawling are disclosed. In some implementations, a method includes obtaining sitemap information for a plurality of websites; and analyzing the sitemap information to identify a website, in the plurality of websites. The website has sitemap information that is at least potentially out of date. The method also includes updating the sitemap information for the identified website by downloading updated sitemap information for the identified website; and scheduling documents for crawling in accordance with the updated sitemap information for the identified website.

A method of analyzing documents or relationships between documents includes receiving a notification of an available metadata document containing information about one or more network-accessible documents, obtaining a document format indicator associated with the metadata document, selecting a document crawler using the document format indicator, and crawling at least some of the network-accessible documents using the selected document crawler.

Mobile SiteMaps

Methods and systems for a web crawler scheduler that utilizes sitemaps from websites are described. A web crawler scheduling system receives a notification from a website or web server. In response to the notification, the system accesses one or more sitemap(s) for documents associated with the website or web server. The system schedules crawls of the documents based on information identified from the sitemaps. The system crawls at least a subset of the documents scheduled for crawling.

Methods and systems for a sitemap generating client for web crawlers are described. The client accesses one or more sources of document information about the documents available on a website, such as the file system, access logs, or pre-made URL lists. Document information is extracted from the sources and one or more sitemaps are generated based on the extracted document information. A notification is transmitted to a remote computer, informing that the sitemap(s) are available for access and likely have been updated. If the remote computer is associated with a web crawler, the remote computer may access the sitemap(s) and use the sitemaps to schedule a crawl of documents included or available on the website.

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Zumikon, Switzerland

Ralph Michael Keller