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[[[ About section: 4.3 Requirement A It seems that "extensibility" of WCAG 2.0 is related to policy makers adopting or extending the criteria of WCAG 2.0. For example, JIS creating additional success criteria specific to Japanese accessibility issues. Is this correct or does it not apply? ]]]
Question as to whether a guideline can be extended: can WCAG success criteria be extended. The guidelines are deliberately generic so that they can be applied and adapted (extended) by different policy makers. Maybe want to indicate that it is O.K. to add additional guidelines/criteria, but do it in the style of the ones here. Yes, extensibility is appropriate and define the mechanism formally.
setting version to LC in case of future use