If any person entitled to an estate for life or years is unknown, the court shall provide for the protection of the rights of the person in the same manner, as far as possible, as if the person were known and had appeared.
Oregon Legal Code
If any person entitled to an estate for life or years is unknown, the court shall provide for the protection of the rights of the person in the same manner, as far as possible, as if the person were known and had appeared.