This work is licensed under the Creative Commons Attribution-ShareAlike License. To view a copy of this license, see the file license.txt, visit http://creativecommons.org/licenses/by-sa/2.0 or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. 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"