Hi, I noticed a couple of things which - for a newb like me - were missing in this otherwise very helpful primer:
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There is no explicit mention that there is actually a switch (Spacial Index), which is hidden amongst many others which you can ignore for the time being, and which you explicitly have to set when you create a new database to load the DC Landmarks into Stardog.
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The queries as listed will not work, and will give no indication why, unless you also include this default prefix:
prefix : http://blog.stardog.com/geons/
HTH
Mark