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The DDD SYSTEMS website is heterarchically organised, having underneath it what in the early days of hypertext’s genesis (circa the mid-1980s) was called a ‘semantic net’ of links to different pages.
For an alternative and relatively easy means to search the website, below is a hierarchical organisation of it. N.B. A proper hierarchy is defined as where child nodes have only a single parent node, whereas a heterarchy still has levels, but its nodes may have multiple parentage, sibling and child links.