create a pcell ( symbol, not layout), and create its cdf.

Hi, 

I want to create a symbol(not layout) by using pcell so that i can add cdf and easily change the pin number when use it. Just like analogLib, nport. i have already known how to dump the cdf code of "analogLib" so i can make a reference. however i have no ideal about writing a "symbol" pcell.

I noticed that cell in analogLib has "spectre" "symbol" "symbol_xform", there is a function  dbCreateXformPCell  ，i write a code as follows:

dbCreateXformPCell( "ind" "pcell_lib" )

But it has error:

argument #1 should be a database object (type template = "dt") - "ind"

Is there any command that I have to add to it?

and it will be very gratefull if you could give me a useful code to let me make a reference, or tell me how to dump the pcell code just like the cdf.

regards,

Jocelyn