XSL Concepts and Practical Use: Reference

XPath Functions

XPath defines the grammer of location paths and a set of functions:

number last(): Returns the ordinal value of the last element in the current context
number position(): Returns the ordinal value of the current element in the current context
number count(node-set): Returns the number of nodes in the specified node set
node-set id(object): Returns the set of elements with the specified ID value
string local-name(node-set): Returns the local name (the name without any namespace qualifiers) of the specified node (or the first node in document order)
string namespace-uri(node-set): Returns the namespace URI of the specified node (or the first node in document order)
string name(node-set): Returns the fully qualified name of the specified node (or the first node in document order)
string string(object): Returns the string representation of the object
string concat(string1, string2, [string3, [string4], ...]): Returns the concatenation of its arguments
boolean starts-with(string1, string2): Returns true if string1 starts with the characters in string2
boolean contains(string1, string2): Returns true if string1 contains string2
string substring-before(string1, string2): Returns the substring of string1 that occurs before the first occurance of string2, or the empty string if not(contains(string1, string2))
string substring-after(string, string): Returns the substring of string1 that occurs after the first occurance of string2, or the empty string if not(contains(string1, string2))
string substring(string, startpos, [length]): Returns the substring of string starting at position startpos of length length, or the rest of the string if length is not specified
number string-length(string?): Returns the length of the specified string
string normalize-space(string?): Returns the specified string with leading and trailing whitespace removed and internal sequences of multiple whitespace characters replaced by a single space
string translate(string1, string2, string3): Returns string1 with the characters in string2 replaced by the characaters in string3
boolean boolean(object): Returns the boolean representation of the object
boolean not(boolean): Returns the negation of boolean
boolean true(): Returns true
boolean false(): Returns false (i.e., not(true())
boolean lang(string): Returns true if the language of the current context node (as specified by xml:lang) matches the specified language string
number number(object?): Returns the numeric representation of the object
number sum(node-set): Returns the sum of the numeric representations of the nodes in the node-set
number floor(number): Returns the largest integer not greater than number
number ceiling(number): Returns the smallest integer not less than number
number round(number): Returns the integer value closest to number