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Sequence Functions

Sequence functions test, rearrange, and aggregate sequences of items. See Sequence, Flow Control, and Typing for the sequence constructors and operators these functions work with.
empty((1,2))false
exists((1,2))true
head((1,2,3))1
tail((1,2,3))(2,3)
insert-before((1,2,3),2,(4,5))(1,4,5,2,3)
remove((1,2,3),2)(1,3)
reverse((1,2,3))(3,2,1)
subsequence((1,2,3,4,5),2,2)(2,3)
unordered((1,2,3,4,5))(1,2,3,4,5)
distinct-values((1,2,3,2,1))(1,2,3)
index-of((10,20,30,30,40,50),30)(3,4)
deep-equal((1,2,3),(1,(2),3))true
zero-or-one((10))10
zero-or-one(())()
one-or-more((1,2,3))(1,2,3)
exactly-one((10))10
count((1,2,3))3
avg((3,4,7))4.6666666667
max((1,2,3))3
min((1,2,3))1
sum((1,2,3))6

ch03-sequence-functions.xpath.txt:
distinct-values((1,2,3,2,1))

(1, 2, 3)