the very idea that an app of some sort needs to be installed - beyond some very fundamental kind of thing, essentially, an operating system - is flawed, faulty, and shows that no one understands what computing is really for, this notwithstanding the fact that you have done amazing things, professors, by mastering apps.
fundamentally, you would describe a space using words, and numbers, which are words, too. this is done using xml, in fact, it is xml, but the xml concept is also universally not understood. xml is not a syntax, and treating it as such robs it of its power. xml is a language concept.
space is empty and has no ... concrete ... structure. it does have an abstract structure.
a concrete structure can be added to the abstraction of an empty space by using the following simple words: four different points, all equidistant*, named point 1, point 2, point 3, and point 4.
a unit of distance is created by this construct: the distance between any two of the four points 1, 2, 3, and 4.
also, directionality is established. go 10 units from point 1 in the direction of point 2.
* the distance between any two of the points is the same as the distance between any and every other two of the points
