[xsl] first occurence of a string value..

["james walker" <jameswalkerandy@xxxxxxxxxxx>]

I wanted to put the first letter of a certain string value as a title if it 
hasnt been visted already (combined with an xsl:sort to sort them 
alphabetically). For example, if the first "i" found was in "id checking" i 
would want to put "i" as the title and if it was found again, i would want 
to ignore it so the utput would look a little like:

I:
id checking
id security

J:
John B
Joisting
.
.
.

Apologies if i havent clarified this very well. I know how to use 
starts-with to get the first letter of each title but wasnt sure if there 
was a first occurence function to use? Also if anyone knows a better way to 
make it alphabetical with titles i would appreciate their input (apart from 
using xsl:sort)
thanks
james

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