This program object is in the Programs folder of the jsonToolkit palette.
As an example, to update each item returned by the base query, you would link from the RelativeJsonSchema’s Current Base Output topic to the Base Item Changed property, and then from the output slot to the publish points proxyExt.
Other properties of the base could be inserted to the topic as desired (not just the name).
The example that is included in the palette illustrates the %s variable substituted by this: "/an/mqtt/example/%s".