st: make syntax options optional

[tashi lama <ltashi32@hotmail.com>]

Hello all, 
      //begin  file.ado //
program file
syntax, doc_id(int) [firm_id(int)]
if "`firm_id'"!="" {
     odbc load, exec("select * from readership where id_value=`doc_id' and source_id=`firm_id' ")
}
else {
     odbc load, exec("select * from readership where id_value=`doc_id' ")
}
list 
end


. file, doc_id(7) firm_id(6429)

invalid syntax

I searched for archive and found out that we need to give a default value for optional options like following 

syntax, doc_id(int) [firm_id(int 5)]

I am not sure if I understood this. Does this not fix firm_id=5? In my case, firm_id will vary. Any idea or hint will be highly appreciated.

Thanks, 
Tashi  		 	   		  
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