[Cassandra Wiki] Update of "API" by JonathanEllis

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The "API" page has been changed by JonathanEllis:
https://wiki.apache.org/cassandra/API?action=diff&rev1=40&rev2=41

Comment:
point to http://cassandra.apache.org/doc/cql3/CQL.html

  == CQL ==
- The preferred interface to Cassandra 1.2 and 2.0 is CQL. There is a quick introduction in GettingStarted and [[http://www.datastax.com/documentation/cql/3.1/webhelp/index.html|full documentation by DataStax]].
+ Cassandra offers a SQL-inspired interface called CQL. The primary difference from SQL is the emphasis on denormalization (via Collections) over Joins.  
  
- To use CQL effectively you should also understand [[http://www.datastax.com/docs/1.2/ddl/index|Cassandra data modeling]].
+ There is a quick introduction in GettingStarted and [[http://cassandra.apache.org/doc/cql3/CQL.html|full documentation here]].
  
+ To use CQL effectively you should also understand the [DataModel].
+ 
- If you plan to write a [[ClientOptions|CQL client]], you should also read about the communication [[https://github.com/apache/cassandra/blob/cassandra-1.2/doc/native_protocol.spec|protocol specification]].  Clients do not need to parse CQL, so you shouldn't need to know the details of the [[http://cassandra.apache.org/doc/cql3/CQL.html|antlr grammar]]
+ If you plan to write a [[ClientOptions|CQL client]], you should also read about the communication [[https://github.com/apache/cassandra/blob/trunk/doc/native_protocol_v4.spec|protocol specification]].  Clients do not need to parse CQL, so you shouldn't need to know the details of the [[http://cassandra.apache.org/doc/cql3/CQL.html|antlr grammar]]
  
  == Thrift ==
- You can read about the legacy Thrift RPC API [[API10|here]].
+ You can read about the deprecated Thrift RPC API [[API10|here]].
  
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