XPath and XQuery Functions and Operators 3.1 defines over two hundred functions, shared by XPath, XQuery and XSLT. Most live in the default namespace http://www.w3.org/2005/xpath-functions 189 (prefix fn:, which you may omit); mathematics is in math:, and maps and arrays in map: and array: (XPath Structured Data). This section covers the families you use daily on catalog data: nodes, numbers and strings. XPath Temporal Functions continues with URIs, dates and sequences.
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XPath Core Functions
XPath 3.1 Core Function Families