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Element: <fallback>

Standard excerpt:
Normally, instantiating an xsl:fallback element does nothing. However, when an XSLT processor performs fallback for an instruction element, if the instruction element has one or more xsl:fallback children, then the content of each of the xsl:fallback children must be instantiated in sequence; otherwise, an error must be signaled. The content of an xsl:fallback element is a template. Examples (xslt:xml):

Interactive xlab: