roslaunch default package

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In a .launch file inside a package, is it possible to omit the package name in a <node> tag if the node package is the same as the package the launcher lives in? I mean, I have a launcher with lines like this:

<launch>

<rosparam command="load" file="$(find my_package)/config/config.yaml" ns="configuration" />

<node pkg="my_package" name="node1" type="node1.py" output="screen" />

<node pkg="my_package" name="node2" type="node2.py" output="screen" />

<node pkg="my_package" name="node3" type="node3.py" output="screen" />

<node pkg="my_package" name="gui" type="gui.py" output="screen" required="true"/>

</launch>

If I want to change the package's name, I'll have to change the pkg argument of all the nodes. Is there a way to omit that, or at least to replace with something like "this" (or "self", as Python programmers use)?

Thanks