[mdx] Joe on section 3.2.1

[Tom Scavo]

On Thu, Sep 26, 2013 at 9:35 AM, Ian Young <ian at iay.org.uk> wrote:
>
> ... the "+" operator in a query is equivalent to set intersection (it's defined as asking for the entity or entities that have id1 AND id2 AND id3).

In mathematics, the "+" operator is akin to union, not intersection.

> It doesn't seem likely that you'd want to query for the intersection of a thousand named sets.

Not a thousand, but certainly more than one, especially if entity
attributes are supported. We *are* supporting entity attributes,
right?

Tom