[NTG-context] understanding elements and \blank

Dear list, if I’m not wrong, elements are defined and configured in ConTeXt with \defineelement and \setupelement in the preamble of the document. Then they can be invoked using the identifier as a command. \definemargindata[MyMarginData][location=outer] \starttext \MyMarginData{Zapf}\input zapf \stoptext My question is; why are blank elements different? \defineblank[MyBlank][10*big] \starttext \input zapf \blank[MyBlank] \input zapf \stoptext Sorry for the basic question, but I’m trying to understand the reason why to explain it to others. Are there other elements that cannot be invoked with \identifier? Many thanks for your help, Pablo -- http://www.ousia.tk