Step 5 - Adding the export tag in package.xml

We need to add the export tag in package.xml and add build and run dependencies:

<export> 
    <nodelet plugin="${prefix}/hello_world.xml"/> 
  </export> 
 
  <build_depend>nodelet_hello_world</build_depend> 
  <run_depend>nodelet_hello_world</run_depend>

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