Optional ReadonlyattributeReadonlyattributesReadonlychildrenOptional ReadonlygettextNames of the attributes that carried the gettext marker _("...").
Present (possibly empty) on nodes parsed from text, so the compiler can
extract exactly the author-marked display strings; absent on nodes built
programmatically by a converter.
ReadonlylocationReadonlytagOptional ReadonlyvalueExact source location where each authored attribute value starts, when parsed from text.
Exact source location of each authored attribute key, when parsed from text.