Why PorterStemmer class is not visible out side the package?

[Rakesh Prajapati]

Hi,
 
I want to use the PorterStemmer class, but as it is not visible to
outside the package I am unable to use it.
 
Is their any specific reason that PorterStemmer is not public?
Thanks & Regards,
Sr. Software Engineer
I- Link Infosoft (G) Pvt . Ltd. 
[EMAIL PROTECTED]