Since this is under discussion, I am hoping some user feedback would be 
helpful.

1. I cannot recall ever having a student stumble over the concept of an 
extension.

2. I cannot recall ever having a student stumble over the colon notation.  
Instead, it highlights nicely that an extension is in use.

3. I already set off file handling into a separate topic in my course.  It 
would be very natural to introduce this as an extension.

4. In contrast to the above, where no issues have arisen, the documentation 
issue raises the bar.  I teach my students to treat the NetLogo Dictionary 
like scripture, always open while they code.  Having to look elsewhere for 
extension documentation is an issue.

5. I cannot back this up, but I suspect that explicit loading of extensions 
is a good thing for students.  It highlights that they are accessing a 
collection with related functionality.  I have never had the impression 
that this "raises the bar".

fwiw,
Alan Isaac

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