Final answer:
SVG (Scalable Vector Graphics) is the vector format that allows definition of object behavior, properties, and relationships in a data structure, and employs an object-oriented data model.
Step-by-step explanation:
In the context of data structures, the type of vector format that employs an object-oriented data model is SVG (Scalable Vector Graphics).
This format is used to define the behavior, properties, and relationships of objects in a graphic context. Unlike other formats like XML, JSON, and CSV, SVG allows for the interaction and manipulation of graphical elements through scripts and programming which supports a more dynamic and visually rich web experience.