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In section 4.1, the text: "Profile X defines an implementation of Level 2 (then Level 1 too) for a specific class of products for example." is unclear. Does it define a separate implementation of level 1? Does it say that all Level 1 content conforms with profile X? Perhaps "(and thus, implicitly, Level 1 also)" would be better. Its not clear which of several possible points the parenthetical clause is seeking to make. Please clarify it.
The proposed rewording is indeed clearer and has been integrated in SpecGL.
setting version to LC in case of future use