MxModels define a namespace, in other words, a self–contained set of strings that define either (1) objects or (2) elements in matrices. Each of these names is unique within the namespace. Therefore, if a name occurs more than once during the specification of an MxModel, it is taken to mean that the name is referring to the same thing. This turns out to be very powerful. For instance, if you name two matrix elements “b” then these two elements are constrained to be equal.
