Why are there 8 edges in a rectangle? and How can I select 4 that define the rectangle?

monroe_weber_shirk

I drew a rectangle in FeatureScript using skRectangle.
I solve the sketch and then debug the resulting sketch to see what is in it. 
It has 8 edges. Is this because it counts the edges going in both directions?
How can I write a query that just returns the 4 edges that define the rectangle?

The broader context is that I got quite confused about every line having two edges when defining a path for a sweep made of 8 lines. I ended up simply selecting the first half of the edges to define the path, but that doesn't seem like the right approach.

konstantin_shiriazdanov

When closed sketch region is created it actually adds to context sheet body on par with wire bodies. those sheet body owns faces, and those faces have their edges around. the interesting thing is that wire bodies edges and sheet bodies edges are treated as different edges which are not topologically connected. This why edge query of a closed region sketch resolved to a double number of edges than one could expect.

So if you want to query face loop edges you need qCreatedBy(..., EntityType.FACE)->qLoopEdges()

and if you want wire edges you need qCreatedBy(..., EntityType.BODY)->qBodyType(BodyType.WIRE)->qOwnedByBody(EntityType.EDGE)

monroe_weber_shirk

Thank you Konstantin. I learned a little more about how Onshape works!