[OS X TeX] Understanding fonts and fontspec

[Johann Spies]

I am struggling to understand how to use the installed fonts in Texlive
2012.

I have run updmap (and updmap.sys) but do not understand how to use the
information in the resultant files.

e.g.  I see the following entry:

pncr8g NewCenturySchlbk-Roman " groffEncoding ReEncodeFont " <groff.enc

And when I try to use it like this:

\setmainfont[Mapping=tex-text]{NewCenturySchlbk-Roman}

and compile using XeLateX, I get:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! fontspec error: "font-not-found"
!
! The font "NewCenturySchlbk-Roman" cannot be found.
!
! See the fontspec documentation for further information.
!
! For immediate help type H <return>.
!...............................................

l.20 ...[Mapping=tex-text]{NewCenturySchlbk-Roman}

So what is the use to me of the information contained in those files?

How do I know the correct names of the fonts (to use in \setmainfont{}?

How do I get a list of all the available fonts to use on my system?

Regards
Johann

-- 
Because experiencing your loyal love is better than life itself,
my lips will praise you.  (Psalm 63:3)
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