12. A system, comprising: one or more processors and memory, the memory comprising one or more sources of document information; and one or more modules including instructions to: access the sources of document information, wherein the sources are associated with a website server; extract the document information including metadata from the sources; generate a sitemap of a website at the website server, the sitemap including a list of documents and corresponding metadata for each of a plurality of documents in the list of documents based on the document information; store the sitemap at a location; and transmit a notification from the website server to a remote computer associated with a web crawler system, the notification including information that identifies the location of the sitemap, the notification functioning as an indication that the sitemap is available for access.
12. A system, comprising: one or more processors and memory, the memory comprising one or more sources of document information; and one or more modules including instructions to: access the sources of document information, wherein the sources are associated with a website server; extract the document information including metadata from the sources; generate a sitemap of a website at the website server, the sitemap including a list of documents and corresponding metadata for each of a plurality of documents in the list of documents based on the document information; store the sitemap at a location; and transmit a notification from the website server to a remote computer associated with a web crawler system, the notification including information that identifies the location of the sitemap, the notification functioning as an indication that the sitemap is available for access. 18. The system of claim 12 , wherein the instructions to generate the sitemap include instructions to generate a list of documents modified after a particular time.