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The "API" page has been changed by JonathanEllis.
http://wiki.apache.org/cassandra/API?action=diff&rev1=32&rev2=33

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   Keyspace:: Contains multiple Column Families.
   CF:: !ColumnFamily.
   SCF:: !ColumnFamily of type "Super".
-  Key:: A unique value that identifies a row in a CF.
+  Key:: A unique string that identifies a row in a CF.  For clarity, rows are 
always identified by keys; columns are identified by names.  Note that Thrift's 
Java code [i.e., Cassandra server] assumes that Strings are always encoded as 
UTF-8, but if you are using a non-Java client, you may need to manually encode 
non-ascii strings as utf8 first.  (This is the major place Thrift does not 
support interoperability between different platforms well.)
+  Column:: A tuple of name, value, and timestamp; names are unique within rows.
  
  == Exceptions ==
   NotFoundException:: A specific column was requested that does not exist.

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