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This component schema definition provides simple type declarations for LOM
data elements that are defined as Vocabulary data types.
This component schema definition enforces that vocabulary values are only
those specified in 1484.12.3 or in a custom vocabulary. This component
schema definition enforces adherence to the combined use of 1484.12.3
defined vocabulary values and custom vocabulary values by checking that both
sources and values are taken from either the token set defined in 1484.12.3 or
from a custom vocabulary.
Organizations are free to define their own namespace for the custom vocabulary
extensions. For completeness this XSD is set up to use a namespace defined
as xmlns:lx="http://ltsc.ieee.org/xsd/LOM/custom"