Any file with a .xml extension can be run as an Ant buildfile. Of course, not all such files really are Ant buildfiles, but no harm is done if you mistakenly attempt to run a non-Ant .xml file as an Ant buildfile.
In this section, we will cover the basic mechanisms for running Ant buildfiles in Eclipse, using the HelloWorld.xml file created in the last section.
But what if you sometimes want to run the buildfile so the Hello target executed first, and other times so the World target was first? Would you have to bring up the dialog each time and change the ordering? Fortunately, as we'll see in the next section, the answer is no.