Act in DEF Mood
In order to use static models for templates, we need to be able to have incomplete static models. An incomplete static model is a model that leaves some content open.
Usually a static model is complete - any content not described by the model is disallowed. For normal static models - D-MIMs, R-MIMs, CMETs - this makes complete sense. But when it comes to templates, such completeness is often not appropriate.