Comment on 11.5 Aggregate Example (with errors)

I find the text confusing, and believe editorial work on the paragraph would help.

http://www.w3.org/TR/2013/REC-sparql11-query-20130321/#aggregateExample2


[[
g	avg	c
<http://example.com/data/#x>	2.5	2.5
<http://example.com/data/#y>		
<http://example.com/data/#z>	2.5	2.5
Note that the bindings for the :y group is not included in the results as the evaluation of Avg({1, _:b2, 3, 4}), and (_:b2 + 4) / 2 is an error, removing the bindings from the solution.


]]

My issue is that bindings for the :y group are included, specifically ?g is bound. Moreover this does answer questions about the more formal text in section 18 about aggregates.

I suggest the following rewrite:

[[

Note that in the bindings for the :y group neither ?avg nor ?c are bound, as the evaluation both  of  Avg({1, _:b2, 3, 4})  and of (_:b2 + 4) / 2 are errors.

]]



Jeremy J Carroll
Principal Architect
Syapse, Inc.