We study various classes of maximality principles, , introduced by J.D. Hamkins, where defines a class of forcing posets and is a cardinal. We explore the consistency strength and the relationship of with various forcing axioms when . In particular, we give a characterization of bounded forcing axioms for a class of forcings in terms of maximality principles MP for formulas. A significant part of the paper is devoted to studying the principle MP where and defines the class of stationary set preserving forcings. We show that MP has high consistency strength; on the other hand, if defines the class of proper forcings or semi-proper forcings, then by Hamkins, it is shown that MP is consistent relative to .

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