How to add new attribute to any Component through SKILL?

[tftu]

Hi! Everyone,

I'm trying to implement an enhanced "add" command
(by SKILL)which can update component attribute like
following:

1.If the attribute name is an existing one, then update
the data of the component instance and place the new
attribute data on the concept desktop.
2.If the attribute name is a new one(not existing in the
default component attribute list), then add the new
attribute entry into the component instance and place
the new attribute data on the concept desktop.

The syntax might like:
addComponent ComponentName(AttributeName AttributeData)

Could anyone advice me how to do it?
Thanks in advance!

BR,

-tftu