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XPath function: string normalize-space (string?)

Standard excerpt:

The normalize-space function returns the argument string with whitespace normalized by stripping leading and trailing whitespace and replacing sequences of whitespace characters by a single space. Whitespace characters are the same as those allowed by the S production in XML. If the argument is omitted, it defaults to the context node converted to a string, in other words the string-value of the context node. Examples (xslt:xml):

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