The @keyscope attribute consists of one or more space-separated key scope names. Map authors define the boundaries for key scopes by specifying the @keyscope attribute on <map> elements, <topicref> elements, or elements that are specializations of <map> or <topicref>. Such elements, their contents, and any locally-scoped content referenced from within the element, are considered to be part of the scope. Keys defined within a scope are only directly referenceable from within the same scope. They can be referenced from the parent scope using the scope's name, followed by a period, followed by the key name.