Function Rewriting for Query Optimization - A Demonstration
Simone Santini, Amarnath Gupta · 2007
this paper. Each region has a boundary (represented by a polygon), a name (which is a string), and some descriptor of the image characteristics inside the region. For our examples, we don't need to specify what the region descriptors are, except to point out that they do not include color. The structure of the data type is shown in figure 2 using a standard graphical notation for class hierarchies