Vocabularies

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The basic vocabulary structure is a tree with the core language as the trunk. Each vocabulary is named and its location exists in a passive keyword in the core. This is illustrated in figure 2.7. Note that some vocabularies are normally hidden but may be linked to the core in special circumstances. Others may be lost by the simple expedient of not including headers. R. G. Loeliger p25

https://en.wikipedia.org/wiki/Namespace In computing, a namespace is a set of signs (names) that are used to identify and refer to objects of various kinds. A namespace ensures that all of a given set of objects have unique names so that they can be easily identified. Namespaces are commonly structured as hierarchies to allow reuse of names in different contexts