Park is a type of Gear. you are likely to find Stranger in/at/on Park. Stranger is related to Foreign. 
Building can be used for Shelter. Shelter is a type of Supply. Supply is related to Storage. Shelf can be used for Storage. 
Gear <--IsA-- Park <--AtLocation-- Stranger <--RelatedTo--> Foreign 
Building --UsedFor--> Shelter --IsA--> Supply <--RelatedTo--> Storage <--UsedFor-- Shelf 