This appendix describes the functions that are built into XQuery. Table A-1 lists all of the built-in functions by subject for easy reference. They are all in the XPath Functions Namespace, http://www.w3.org/2005/xpath-functions.
In addition to a brief sentence explaining the purpose of the function, each function is described by the following characteristics:
"Signature" lists the parameters and their types, and the return type of the function.
"Usage Notes" covers the function in more detail.
"Special Cases" lists error conditions and other unusual situations.
"Example(s)" provides one or more example function calls with their return values.
"Related Functions" lists names of related functions.
XSLT 2.0 has some additional built-in functions, namely
unparsed-text-available. These functions are part of XSLT 2.0 only, not XQuery 1.0 and XPath 2.0, and are therefore not covered in this appendix.
Many of the built-in functions have more than one signature. For example,
adjust-date-to-timezone has a signature with just
$arg, and another with two arguments—
adjust-date-to-timezone($arg as xs:date?) as xs:date? adjust-date-to-timezone($arg as xs:date?, ...