src/swipl-devel/packages/xpce/man/refmanual/md/event_node.md

In rswipl: Embed 'SWI'-'Prolog'

class event_node {#class-event_node}

Node in the type inheritance hierarchy. Do not use this class for other purposes as it's definition is subject to change.

@see class event_tree @see object->recogniser

Instance variables {#class-event_node-instvars}

• event_node<-parent: event_node|event_tree Parent of the node. The root has the event_tree object as a parent.

• event_node<-sons: chain* Chain of event_node objects that represent the sons. Ordering is not defined.

• event_node<-value: event_id event <-id associated with this node.

Send methods {#class-event_node-send}

• event_node->initialise: value=name, parent=[name|event_node]* Create an event_node object below parent. By creating a new event_node the set of valid names for the type event_id is extended and event objects of this new type can be created.

  The system defines a node named user for user-defined event-types.

  See also @event_tree, event->initialise and event->is_a.

• event_node->son: event_node @see !already_has_parent

rswipl documentation built on June 16, 2026, 5:07 p.m.