applet PARAM tag: value of NAME must be lower case

It appears that the name of a parameter to an applet (as in <PARAM
NAME=foo value=bar>) must be lower case in order for getParameter() to
pick up its value.

Assume a document containing

 <APPLET ...><PARAM NAME=startup VALUE="a bunch of text"></APPLET>

We run it through the AppletViewer. In the applet's init() method,
getParameter("STARTUP") and getParameter("startup") both return "a
bunch of text".

But if the document contains

 <APPLET ...><PARAM NAME=STARTUP VALUE="a bunch of text"></APPLET>

then both getParameter("STARTUP") and getParameter("startup") return null.

Is this a problem with the DTD, or should it be documented to work this way?