[xsl] Got a slick XPath expression to convert NEW YORK to New_York?

["Roger L Costello costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hi Folks,

I need to convert multi-word names that are space-separated and uppercase to
names that are underscore-separated, first letter of each word uppercase and
remaining letters of the word lowercase.

Example: NEW YORK --> New_York

Example: SIMULATION INDICATOR --> Simulation_Indicator

Do you have a slick XPath expression that does this transformation?

/Roger