What is the package for URLLoader and URLRequest in Flash Builder

I am trying to setup two variables:

var xmlURLLoader:URLLoader = new URLLoader();
var xmlURLRequest:URLRequest = new URLRequest();

I am taking some old AS code and trying to plug it into Flash Builder. I am getting a "Type not found." warning with those variable declaration开发者_JAVA技巧s. Does anyone know which package to import?

flash.net.URLLoader;
flash.net.URLRequest;

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