Shoudn't it be called "deleted text", as the exact presentation depends on the style?

What are the use cases where this is actually required?

The proposed markup collides with the traditional use of "--" to mean a dash, and with the traditional signatures -- so it's not CollisionFree.

-- RadomirDopieralski, 2006-12-15

Agreed. It's useful in blog-like applications, but in a wiki it's just easier to delete the text. I see no real use case for this, and it only serves to confuse people.

-- JanneJalkanen

Actually this is CollisionFree. TiddlyWiki uses "--" to mean mdash and also uses --strike-- formatting. The formatter distinguishes between a freestanding "--" and "--" wrapping a word or phrase. This is fairly straightforward to implement (I know, because I implemented it for TiddlyWiki).

-- MartinBudden, 2006-12-17

Not everyone puts spaces around dashes and signatures -- it is the current recommendation for modern typography, but some people follow old style or like to experiment. Also note how this looks in the raw page text -- as if someone inteded to insert a word surrounded by dashes, just didn't make the spaces. But this is a minor issue, and indeed there is a million ways to solve that.

The fundamental issue is "Do we need it hard enough to make Creole more complicated"?

Another concern about it being CollisionFree -- looking at the markup summaries on Wikimatrix I see that engines use "--" and "~" interchangeably. So, no matter which one we choose for "deleted text", we will introduce a conflict with some of the existing markups. -- RadomirDopieralski, 2006-12-18

I agree, we should keep creole simple, but not simpler of course :). It should be possible to describe creole on a single cheet sheet. I never missed this markup in jspwiki. I would't count it to the common things people need. You still can use native markup in a mixed mode to do it. Maybe we could have some standard extentions for creole in the future, but i think it's to early now.

-- Christoph, 2006-12-19

I am not sure that Creole needs to specify an addition for this rather exotic formatting; I would be for leaving it apart. Otherwise, I think that the --stricken text-- syntax is the best because of its intuitivity

--DanieleC., 2007-Jul-05