[ '[all]' | '[implicitElement]' ]?
[all] is specified, this command transcludes all the inclusion directives (e.g.
xi:include elements) found in the document being edited.
Otherwise, this command replaces the selected inclusion directive by up-to-date included nodes. For this case to work, the explicitly selected element or processing-instruction or the implicitly selected element (when option
[implicitElement] has been specified) is expected to be an inclusion directive.
This command is the inverse of uninclude.