I was looking for more algebraic relational languages this weekend after seeing some Youtube video about Cypher; the video used nice glyphs for showing complex Cypher queries which was far far more readable and nice that Cypher (let alone SQL). Unfortunately I cannot find the origin of those glyphs, so I started looking for languages. So I can add this one to the list, thanks.

And nice to see TCL again; I used to write a lot in it.