Used to define recovery action to be taken when an instruction element is used in the stylesheet and no implementation of that element is available.
Permitted parent elements: xsl:analyze-string ; xsl:evaluate ; xsl:fork ; xsl:merge ; xsl:next-match ; xsl:try ; any XSLT element whose content model is sequence constructor; any literal result element
Element has no attributes
xsl:fallback element is used when a stylesheet contains an
instruction element and no implementation of that element is available. An
element is an instruction element if its namespace URI is the standard URI for
XSLT elements or if its namespace is identified in the
extension-element-prefixes attribute of a containing literal result element, or in the
extension-element-prefixes attribute of the xsl:stylesheet element.
xsl:fallback element appears in any other context, it is
ignored, together with all its child and descendant elements.
If the parent element can be instantiated and processed, the
xsl:fallback element and its descendants are ignored. If the
parent element is not recognised or if any failure occurs instantiating it, all
xsl:fallback children are processed in turn. If there are no
xsl:fallback children, an error is reported.