Embodiments may implement processing and presentation of information with, e.g., standalone and/or application integration, object-oriented, hierarchical architecture, in the form of, e.g., an add-in application or a computing platform for creating, modifying, interpreting, compiling, and/or executing an application. Embodiments may be implemented as a discrete computing platform or as an overlay, allowing interoperability with capabilities of the overlaid platform. Many embodiments correspond to computing platforms that support a new computing paradigm, a definition-centered paradigm. The definition-centered paradigm is an object-oriented hierarchy referred to as a Model hierarchy with one or more data structures referred to as Entities and, in many embodiments, interface types referred to as Relations. Each Entity has a defined type that specifies the data structure layout and supported functions. Each data structure type may implement a set of Relations, forming part of a type hierarchy that affects the resolution of the Model.