[Cassandra Wiki] Update of "DataModel2" by MichaelGreene

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The following page has been changed by MichaelGreene:
http://wiki.apache.org/cassandra/DataModel2

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  Timestamps can be anything you like, but milliseconds since 1970 is a convention, as returned by System.getTimeMillis() in Java. Whatever you use, it must be consistent across the application otherwise earlier changes may overwrite newer ones.
  
  = Column Families =
- A column family is a container for columns.  You define columns in your storage-conf.xml file, and cannot modify them (or add new column families) without restarting your Cassandra process.  A column family holds an ordered list of columns, which you can reference by the column name.  A JSON representation would be
+ A column family is a container for columns.  You define column families in your storage-conf.xml file, and cannot modify them (or add new column families) without restarting your Cassandra process.  A column family holds an ordered list of columns, which you can reference by the column name.  A JSON representation would be
  {{{
  { Users : {
    emailAddress : {  // this is a column