Getting error on vaiable code declaration

programming flash
1

Hi,

I am getting the following errors for this code:
AS3 Code:

var xmlcontents:String = {firstName} {lastName} {numbtrial};

Error:
1084: Syntax error: expecting colon before rightbrace.
1084: Syntax error: expecting identifier before rightbrace.
1086: Syntax error: expecting semicolon before leftbrace.
1084: Syntax error: expecting rightbrace before end of program.

Where it goes wrong?

Thanks.