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Part 4:

Sticking on the server side, we can make a stab at adding a new MessageAction method to our current Controller. This will expect one piece of information: a new chat message. XML has a number of illegal characters you may not use within XML content. We could use the CDATA style enclosures to tell parsers to ignore such characters but unfortunately SimpleXML is not quite up to handling CDATA. Instead we'll simply ensure the message is passed through htmlentities() to turn HTML special characters into their entity equivalents. This has much the same effect at the cost of a little added complexity.

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