XSLT and XPath function reference in alphabetical order
(Excerpt from “XSLT 2.0 & XPath 2.0” by Frank Bongers, chapter 5, translated from German)
String functions – codepoint conversion
A sequence of xs:integer integers; the Unicode Codepoint values which represent the characters of the input string.
Obligatory. A xs:string string whose characters shall be converted to a sequence of Unicode Codepoint values.
Purpose of use:
The fn:string-to-codepoints() function is the counterpart of the fn:codepoints-to-string() function. It returns a sequence of integer values each of which corresponds to a Unicode Codepoint and which represent the individual characters of which the input string consists of. If the input string is the empty string, the function returns the empty sequence.
A possible problem results from the Unicode specification which, under certain circumstances, assigns several different codepoints (or a sequence of codepoints) to identical abstract characters. Therefore, the conversion does not necessarily have to be unique. For example, the Å character is representable by the codepoint 0197 (»latin capital letter a with ring above«) or the codepoint 8491 (»angstrom sign«).
Remark: The »Unicode Codespace« which can be used for the definition of codepoints includes the integer range from 0 to 10FFFF (hexadecimal), which means 0 to 1.114.111 (decimal).
Example – application on an input string:
results in the sequence: (72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33).
In this example, each character of the input string is represented by the decimal number of its Unicode Codepoint, for example the H (Unicode U+0072) by 72.
The function is not available.
fn:string-to-codepoints($arg as xs:string?) as xs:integer*
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