1. Well, this is getting amusing. Using the definition of a Catholic Encyclopedia is certainly an improvement over a Webster dictionary. However, as I said in a previous post,
the Catholic Excommunication is actually quite different from what it was in the Middle-Ages or even some decades ago. For example, until the Council Vatican II there was an extreme form of excommunication, the Vitandus.
Hence, maybe it's not wise to quote an article from the
... 1913 Catholic Encyclopedia. Yeah, that's the version published in the NewAdvent site (a great resource on Catholic do ents, btw).
Anyway, addressing what's supposedly clear to you:
I think it's clear from this that decision-making does indeed go on within the church regarding excommunications.
Let me quote part of the article:
As I've said before this was a latae sententiae excommunication.As the article you quote says it "is incurred as soon as the offence is committed and by reason of the offence itself (
eo ipso) without intervention of any ecclesiasticall judge". Thanks for proving me right.
Second:
It's also clear to me that the penalized parties are excluded from participating in communion, although not necessarily forever.
I'd strongly suggest you to re-read my previous post. As I've said,
the subjects aren't allowed to receive the Eucharist.
I don't know what you mean by excluded from participating in communion - is it the exile? If so, that kind of excommunicated - the
vindati - is no longer practiced. And if it was, it would require conditions not fulfiled in this case.
To sum it up: if your Catholic friends aborted, they were excommunicated by latae sententiae. From that moment till the second they confessed and repented their act, they weren't able to receive the communion and some other Church activities (like to help the priest in the liturgy) but they were still able to attend the Mass. At any moment they were excluded from the Church.
I think the lesson here is that if you're going to quote an article, read it till the end - even if it's a wrong one.
There are ways to kick one out of the Catholic Church. However, Excommunication (as defined by the 1983 Code of Canon Law for the Roman Church -
http://www.vatican.va/archive/ENG1104/_INDEX.HTM) is not one of them.