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XSLT function: boolean function-available (string)

Standard excerpt:

The argument must evaluate to a string that is a QName. The QName is expanded into an expanded-name using the namespace declarations in scope for the expression. The function-available function returns true if and only if the expanded-name is the name of a function in the function library. If the expanded-name has a non-null namespace URI, then it refers to an extension function; otherwise, it refers to a function defined by XPath or XSLT. Examples (xslt:xml): Overview

Interactive xlab: [xsl:value-of] [xsl:template]