Property:Has talk type

This property is of type Has type::Text.

It accepts these values:
 * Allows value::Talk
 * Allows value::Regular talk
 * Allows value::Technical talk
 * Allows value::Lightning talk: A very short talk (less than 5min, possibly just 1 or 2min)
 * Allows value::Keynote: A keynote talk, usually at the beginning of a conference day
 * Allows value::Demo: A technical demonstration, for example, of a software or a web site
 * Allows value::Hackathon: An event where developers come together to discuss code and to work on solutions, often organised in an open-space style
 * Allows value::Tutorial: A session that is aimed at training or education
 * Allows value::Discussion: A discussion session, involving the whole audience or a panel of speakers
 * Allows value::Presentation
 * Allows value::Workshop