[XeTeX] Maths and Symbols in Latex

[Atip Asvanund]

Suppose that I am using Hoefler, and am using the following declaration
that I found on the mailing list. How would I get the Maths and Symbols to
show up? Right now equations and symbols do not show up. Additionally,
bullets do not show up either. What other declarations do I have to make?
IF you can, please provide an example. Thank you.

Atip

\DeclareFontShape{U}{hoefl}{m}{fn}%
      {<-> "Hoefler\space Text:Vertical\space Position=Superiors"}{}
\DeclareFontFamily{U}{hoefl}{}
\DeclareFontShape{U}{hoefl}{m}{n}%
      {<-> "Hoefler\space Text"}{}
\DeclareFontShape{U}{hoefl}{m}{it}%
      {<-> "Hoefler\space Text\space Italic"}{}
\DeclareFontShape{U}{hoefl}{bx}{n}%
      {<-> "Hoefler\space Text\space Black"}{}
\DeclareFontShape{U}{hoefl}{b}{n}%
      {<-> ssub * hoefl/bx/n}{}
\DeclareFontShape{U}{hoefl}{bx}{it}%
      {<-> "Hoefler\space Text\space Black\space Italic"}{}
\DeclareFontShape{U}{hoefl}{b}{it}%
      {<-> ssub * hoefl/bx/it}{}
\DeclareFontShape{U}{hoefl}{m}{sc}%
      {<-> "Hoefler\space Text:Letter\space Case=Small\space Caps"}{}
\renewcommand{\encodingdefault}{U}
\renewcommand{\rmdefault}{hoefl}

\makeatletter
\def\@makefnmark{\hbox{\fontshape{fn}\selectfont\@thefnmark}}
\makeatother