built-in data type
The markup events of markup-element-event type represent element events that trigger an element rule when encountered by do markup-parse in a markup source. This event type is
a subtype of markup-region-event, which means that it is signalled using #markup-start and #markup-end.
You can obtain a markup-element-event instance in following ways:
#current-markup-event inside an element rule,
current elements shelf during a parse, or more generally from the elements of shelf,
create-element-event.
Given one markup-element-event instance, you can access other element events related to it using
various element expressions:
Every markup-element-event has the following properties associated with it, either from its
declaration or assigned by the parser: