Show distinct values of a key from a single line

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http://www.unix.com – Hi All, I am newbie to linux. Can somebody help me with following requirement. I have one huge line. I have to find out particular key/value pair to see the distinct value of that key. Portion of the String:- <?xml version="1.1" encoding="UTF-8"?> <Data><Val Ti="1342750845538" Du="0" De="blackberry8520_ver1RIM" Db="encyclopedia" Pdb="" Uq="0" Dq="0" qry="http://google.com/sdsds?q=dsds&dsdsds=dsds&ss?" ab="dsds" Dc="4" Te=" Ca="xxx" Sc (HowTos)