[xsl] Document order for keys?

["james walker" <jameswalkerandy@xxxxxxxxxxx>]

When finding the first of a group of keys:
key(?ve-by-firstocc?, substring(entrydata[3]/text, 1, 1))[1] would this find 
the first node in document order or the order which its puts the list in 
(e.g. if its alphabetical).

if the xml order is such that the order of the nodes are not alphabetical:
bob
bab
burt

would the key expression above select bob or bab?

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