Before revision:  Besides allowing for ordered spreads and an exact fit to the initially observed term structures, this general framework leads to tractable valuation formulas for caplets and swaptions and embeds most of the existing multi-curve models based on affine processes. In particular, in the case of a model driven by a Wishart process,  we derive a closed-form pricing formula for caplets.
After revision:  Besides allowing for ordered spreads and an exact fit to the initially observed term structures, this general framework leads to tractable valuation formulas for caplets and swaptions and embeds most of the existing multi-curve affine models. The proposed approach also gives rise to new developments, such as a short rate type model driven by a Wishart process, we derive a closed-form pricing formula for caplets.