/usr/share/roslaunch/resources/example-params.launch is in python-roslaunch 1.11.16-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
Parameter Server parameters. You can omit the 'type' attribute if
value is unambiguous. Supported types are str, int, double, bool.
You can also specify the contents of a file instead using the
'textfile' or 'binfile' attributes.
-->
<param name="somestring1" value="bar2" />
<!-- force to string instead of integer -->
<param name="somestring2" value="10" type="str" />
<param name="someinteger1" value="1" type="int" />
<param name="someinteger2" value="2" />
<param name="somefloat1" value="3.14159" type="double" />
<param name="somefloat2" value="3.0" />
<!-- you can set parameters in child namespaces -->
<param name="wg/wgchildparam" value="a child namespace parameter" />
<group ns="wg2">
<param name="wg2childparam1" value="a child namespace parameter" />
<param name="wg2childparam2" value="a child namespace parameter" />
</group>
<!-- use rosparam for more complex types -->
<rosparam param="list">[1, 2, 3, 4]</rosparam>
<rosparam>
rp_key1: a
rp_key2: b
</rosparam>
<!-- use rosparam files -->
<group ns="rosparam">
<rosparam command="load" file="$(find rosparam)/example.yaml" />
</group>
<!-- upload the contents of a file as a param -->
<param name="configfile" textfile="$(find roslaunch)/resources/example.launch" />
<!-- upload the contents of a file as base64 binary as a param -->
<param name="binaryfile" binfile="$(find roslaunch)/resources/example.launch" />
<!-- upload the output of a command as a param. -->
</launch>
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