On 2013–02–15 "H. Özoguz" wrote:

> working on a book with many too long sentences, I got the following
> idea/question:
> Is it possible to recognize the length of a sentence, and to let
> context show in the pdf, if there is a too long sentence.

This sounds more like a job for the text editor. Many text editors
already know what a sentence is. That means it's as easy as looping
over all sentences and counting the characters/bytes and performing
some action (e.g. placing the cursor or injecting a ConTeXt macro).

Marco