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I did not read the question well enough -- the problem is not related to rdf-schema.xml, but to the fact that there simply are no drawers that your query could return since no map has been loaded.

This problem appears since you are using the wrong instructions: As the box at the head of this wiki page says, the instructions on that page are only valid for the catkinized version of KnowRob. Since you are using the rosbuild-based version, you will need to follow the given link to the previous version.

That page will tell you that you have to start with the mod_vis instead of the knowrob_common package, which automatically loads an environment map, so that your query will have results.

I did not read the question well enough -- the problem is not related to rdf-schema.xml, but to the fact that there simply are no drawers that your query could return since no map has been loaded.

This problem appears since you are using the wrong instructions: As the box at the head of this wiki page says, the instructions on that page are only valid for the catkinized version of KnowRob. Since you are using the rosbuild-based version, you will need to follow the given link to the previous version.

That page will tell you that you have to start with the mod_vis instead of the knowrob_common package, which automatically loads an environment map, so that your query will have results.