Was rewriting the following paragraph but the SVG link appear to be bad. And it seems like the "UML (svg) diagram for 4.1.x" is the same as the "Gramps Data Model" anyway.
This document supplements the comprehensive [https://www.gramps-project.org/docs/ API Reference Documentation for the {{man version}} version of Gramps], the simple <abbr title="Unified Modeling Language">[https://wikipedia.org/wiki/Unified_Modeling_Language UML]</abbr> [[Media:API.svg|(svg) diagram for 4.1.x]] and the [[Gramps Data Model]] overview.