See also http://lists.oasis-open.org/archives/oic-comment/201004/msg00000.html

Section 2.1 General. Rather than define new terms for conformance and targets etc, the TC might want to consider reusing the terms and definitions from the OASIS Conformance Guidelines (http://docs.oasis-open.org/templates/TCHandbook/ConformanceGuidelines.htm) I didn't observe any contradictions, however I did see some terms (such as classes) that are not defined in the Guidelines. Promoting a common vocabulary increases consistency across OASIS products.