I have found some old code to visualize a WordCloud using iKnow.
This code is showing the concepts of a source, and adds weight according to a simple tf/idf score.
I have put the (old) code on github here
The code is using %iKnow.Queries.EntityAPI.GetBySource, and the CSP page is using the jquery library from AwesomeCloud to render the wordcloud. (Today I would not use CSP pages anymore with Caché script or CSP tags, but like i said, it is old code;)
After importing the xml from github, the url to call looks like this :
and the result would be something like :