Formatting section titles in an appendix

I'm running into a bit of difficulty formatting section titles within an appendix, without breaking titles in chapters. I'm attempting to format <sect1> and <sect2> children of an appendix to be different than those in chapters. Specifically

	+ Section titles in an appendix shouldn't be numbered (but the Appendix itself *should* be numbered; basically, appendixes need a different numbering depth)
	+ Section titles in an appendix need different font sizes and margins than those in chapters (i.e. different attribute set).

I'm not sure where to actually customize these things in my customization and/or titlepage spec. Assistance pointing me in the right direction (or the applicable section in the XSL guide) would be greatly appreciated.

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David Goss, M.A. 
Technical Writer, Laboratory Division 
Frontier Science & Technology Research Foundation 
4033 Maple Road 
Amherst, NY 14226 
(716) 834-0900 x7218