This example demonstrates a drag-and-drop interface for building workload models. Users can select items from an available pool and drag them into different collection and target containers, organizing them into a hierarchical structure. The interface supports creating clones, deleting items, collapsing containers, and saving or restoring connection states. It is implemented using custom HTML elements defined through the Web Components API, with drag-and-drop handled by native HTML5 events and SVG graphics embedded within draggable items.