The document discusses the SEC's new requirement for public companies to submit financial statements and other reports in XBRL format. It provides an overview of what XBRL is, how it works by tagging financial data using standardized elements defined in taxonomies, and the benefits it provides by making financial data easily readable by computers. The SEC rule requires affected public companies to submit XBRL-formatted financial statements and other information as exhibits to certain filings, and to post this information on their websites. The requirements will be phased in over three years beginning in 2009.