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/1.0 or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. This component schema provides simple type declarations for metadata elements whose values are taken from a vocabulary datatype. This component schema supports loose validation of vocabulary value constraints by allowing both the source and value to be arbitrary strings.