_pushContext();
} else if (_toplevel == null) {
// NOTE: We used to set _toplevel to newEntity, but
// this isn't quite right because the entity may have a
// composite name.
_toplevel = entity.toplevel();
// Ensure that if any change requests occur as a
// consequence of adding items to this top level,
// that execution of those change requests is deferred
// until endDocument().