eXtensible Business Reporting Language (XBRL) is an XML-based language for the electronic transmission of business and financial data.  XBRL is not an accounting standard; it is simply a standard for transmitting business and financial data. 

The primary XBRL items in this Form 10-K are (i) the Consolidated Statement of Income for the year ended December 31, 2010, 2009 and 2008, (ii) the Consolidated Balance Sheet at December 31, 2010 and 2009, (iii) The Consolidated Statement of Changes in Equity, (iv) the Consolidated Statement of Cash Flows for the year ended December 31, 2010, 2009 and 2008, and (v) Notes to Consolidated Financial Statements (tagged as blocks of text).  The items can be viewed interactively by linking to the SEC website,
http://www.sec.gov/cgi-bin/viewer?action=view&cik=714603&accession_number=0001047469-11-001554&xbrl_type=v#.

Alternatively, you have the option of viewing the XBRL information through any XBRL viewer you select. The data should be displayed in a readable format when you import all the files into your XBRL viewer.  The data in its native XML format (displayed when you merely open, and do not import, these items) will not be readable by you.  A resource for selecting an XBRL viewer is http://www.sec.gov/spotlight/xbrl/viewers.shtml.