# Prolog declarations with query body

# Namespace declaration
declare namespace ns = "http://example.com"; //ns:item

# Variable declaration
declare variable $x := 42; $x + 1

# Function declaration
declare function local:double($n) { $n * 2 }; local:double(21)

# Function with type
declare function local:add($a as xs:integer, $b as xs:integer) as xs:integer { $a + $b }; local:add(1, 2)

# Multiple declarations
declare namespace lib = "http://example.com/lib"; declare variable $max := 100; for $x in 1 to $max return $x