Base tag question

[James Howe]

Is there some reason why the base tag defined in the HTML tag library 
doesn't let you specify the optional target attribute?  I'm working with a 
frames based web application and I need to use both the href and target 
attributes.  I know I could subclass the custom base tag, but before I do, 
I was wondering if there was any particular reason why the standard Struts 
base tag does let the user specify the target.

Thanks.