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This part of ISO/IEC 23090 specifies an architecture and data model for interchange of scene-based media for use in systems and applications that employ renderers for the presentation of immersive media, including audio, visual, tactile and other representations of media types. Clients of such systems and applications are referred to as render-based clients. At the core of the model is a vocabulary of terms and definitions that can be used to annotate a scene graph or scene asset with metadata, i.e., to facilitate the translation of media from one format to another. Such translation from one format to another format is a commonly encountered challenge in the distribution of scene-based media, as a number of formats have emerged to gain popularity in various application areas, e.g., gaming, social media, e-commerce, and content production. The corresponding vocabulary of terms and definitions describes nodes, media formats, media attributes, and render processing instructions of commonly-used scene graph formats and media representations. This collection of terms and definitions is referred to as the Independent Mapping Space (IMS). Elements from the Independent Mapping Space may be used to annotate a scene graph or media format so that its translation to another format is more straightforward and consistently performed. Thus, the IMS facilitates the distribution and interoperability of a variety of scene-based media into render applications that are limited in the types of formats that they are designed to support. Such render applications are anticipated to serve an essential role in the emerging Metaverse.