Are documents from the above mentioned Congregation ever replaced by other documents or ideas? The documents I have in mind are adoremus.org/LiturgicaeInstaurationes.html and adoremus.org/InaestimabileDonum.html There are some points in these documents that I want to make sure that our liturgy follows at our parish.
Since many liturgical matters are disciplinary, instructions from the CDW can be abrogated by subsequent instructions.
The documents you mention are some very important post-conciliar documents on the liturgy.
I would highly recommend also Redemptionis Sacramentum, which is much more recent (2004, I think), and which re-affirms and makes yet clearer certain points about the liturgy.