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One option could be to use relative param names in xyz.launch (instead of absolute ones) and put the include file inside a group with a namespace:

<launch>
  <group ns="prefix">
    <include file="xyz.launch"/>
  </group>
</launch>

<launch>
    <param name="a/hello" value="10" />
</launch>

Not exactly a remap, but if you just whant to add a prefix, it should work.

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