so if i let $path=/html/body/Table/tr/td[1]/p
$tag=td
$index=1,2,..>

It's not at all clear what you mean by "extract" here.
If you just went
select="/html/body/Table/tr/td/p"
then that would select all p from all td elements and you would not need
[1] [2] etc at all.

infact i want to generate a list seperate of Value (Name of different Author) to an XML file like this:
       <AuthorName>
value at Xpath:  "/html/body/table/tr/td[1]/p"                                                     </AuthorName>