Feasibility of "do all application coding in the XML languages"?

["Costello, Roger L." <costello@mitre.org>]

Hi Folks,

I am exploring the idea of "do all application coding in the XML languages."

Here is a response from a colleague:

"... in general XSLT is cool but limited. If your transform requires any "higher math" or advanced functionality or external code libraries (such as geometry coordinate system libraries), you almost always have to go back to a higher level language (such as Java) at some point."

Does my colleague make a TRUE or FALSE statement?

/Roger