How Text Can Be Made Subscripted In Xml Document?

[sunspider]

SIR,
I WANT TO DISPLAY MATHEMATICAL FORMULAS,WHICH INCLUDE MATHAMATICAL NOTATIONS LIKE "SIGMA" "DELTA" AND SO ON, AND ALSO SYMBOLS WITH SUBSCRIPTED TEXTS OR LETTERS,IN XML DOCUMENT.
MY PROBLEM IS HOW CAN WE RENDER SUBSCRIPTED TEXTS IN XML DOCUMENT.
FOR Eg.CONSIDER THE FORMULA SHOWN BELOW,IN HTML FORMAT.

(SIGMA SYMBOL)Ali * Bli / Cli

PLEASE,TELL HOW THIS CAN BE REPRESENTED IN XML DOCUMENT.
AND ALSO TELL ME HOW CAN A HORIZONTAL RULE BE DRAWN IN XML DOCUMENT

THANK YOU.

[Phidev]

Why dont you create a especial notation for each symbol, and have a parser handle it.

As a matter of fact the formula that you wrote makes perfect sense, why dont you just store it like that.

Also, if you want to display the actual symbols in the browser, well the you are out of luck. You will some sort of plug in.