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Public Sources re: "Structure" It is also relevant to look at how public sources define "structure." For example, Wikipedia: • Begin at "structure" on Wikipedia.4 The choices from there are: physical structure; biological structure; chemical structure; musical composition; social structure; data structure; and software structure. The most appropriate choice appears to be physical structure. • The physical structure section states: "Built structures are a subset of physical structures resulting from construction. These are divided into buildings and nonbuilding structures, and make up the infrastructure of a human society."5 This division is helpful, as it is similar to how Measure PP divides the world — i.e., into "housing units" and "structures," the implication being that housing and structures are different and separate categories. • So what does Wikipedia tell us "nonbuilding structures" are? "A nonbuilding structure, also referred to simply as a structure, refers to any body or system of connected parts used to support a load that was not designed for continuous human occupancy. The term is used by architects, structural engineers, and mechanical engineers to distinctly identify built structures that are not buildings."' The page goes on then to list a variety of examples of structures, including: "roads" and "bridges" and "retaining walls." • Wikipedia likewise begins its discussion of "retaining walls" with `A retaining wall is a structure ....' When trying to determine what a voter might have been thinking in casting his or her ballot for Measure PP, "common man" sources like Wikipedia provide valuable insight. Wikipedia strongly supports that roads and retaining walls are structures. The 2013 Commission Voted Unanimously That Roads Are Structures Though the current Planning Commission disagrees, it is worthwhile to note that the 2013 Commission stated as follows: Commissioner Pearce ... indicated that she has been reading this over and over, and she cannot get to the point where she cannot consider a road a structure. She stated, in her opinion, roads under Measure PP and the Municipal Code are structures. 4 http: / /en.wikipedia.org/wiki /Structure 5 ham: / /en.wikipedia.org /wiki /Structure #Physical structure 6 ht tp:// en .wikipedia.org/wiki /Nonbuildine structure http: / /en.wikipedia.or ;t /wiki /Retaining wall; see also http : / /en.wikipedia.org/wiki /Bridve