the 1EdTech Vocabulary Definition Exchange (VDEX) standard defines a grammar for the exchange of value lists of various classes: collections often denoted "vocabulary." Specifically, VDEX defines a syntax for the exchange of simple machine-readable lists of values or terms, together with information that may aid a human in understanding the meaning or applicability of the various terms. VDEX may be used to express valid data for use in instances of 1EdTech Metadata, 1EdTech Learning Information Services, 1EdTech Common Cartridge, etc., for example. In these cases, the terms are often not human language words or phrases but more abstract tokens. VDEX can also express strictly hierarchical schemes compactly while allowing for more loose networks of relationships to be expressed if required.
