[dev-context] confused with keys-xx.xml files

Hi, in cont-en.xml: reservefloat: in keys-de.xml: Why is "on" a constant in cont-en and a variable in keys-de.xml? What is a variable and what is a constant? In my understanding, "frame" here should be a variable, because it can be either "on" or "off". Patrick -- ConTeXt wiki: http://contextgarden.net