Functions

Predicates, conditional elements like xsl:if or xsl:when, or output generators can also use functions.

For example: test whether the substring in the current element's content, starting at character #5 and having two characters, can be converted to the number 25:

   <xsl:if test="number(substring(.,5,2))=25">

There are around 35 functions, including

• conversions (eg, number())
• string manipulation (eg, concat())
• arithemetic (eg, floor(), sum())
• getting node and identifier names (eg, lang())
• boolean (eg, not())
• context information (eg, last())