Add/Import data that is not in the Knowledge Base?

Questions
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1

I am setting up some lessons for students to work with Real-World data. Sometimes I want to ask questions using data that are not (yet) available from the Wolfram Knowledge base. For example instead of using the Eiffel Tower as a Geolocation, I want to use a local place like as the Amsterdam Dam Square. Is there a way to put this in in a way similar to built-in entities, so I can use the same syntax and algorithms to calculate with?
(Another example: I could not ask students to compute the weight of an elephant divided by the weight of a human (since that weight is missing. Strange enough I can get a proper answer for this from Wolfram Alpha …).
Any suggestions on how to do these elegantly?

Ted

2

Version 11 allows you to make your own Entities using:

If you know the location of the Dam Square you could of course specifiy it as a GeoPosition. Weights (masses) can be stored using Quantity

3

Thanks Sander, I will try that as soon as I get Version 11 on my Mac.
Is there any other way to achieve the same goal with version 10.3 on Raspberry Pi? (because that is what the students use)
I hope version 11 will become available soon for the Raspberry Pi too, but I do not know what the plans are.

4

Not really? Entities are just expressions like everything else, but I’m not sure how you’d get things like EntityValue to work without messing with it.