The element-available function tests whether an element, entered as the only string argument of the function, is supported by the XSLT processor.
The argument string is evaluated as a QName. Therefore, XSLT elements must have an xsl: prefix and XML Schema elements must have an xs: prefix—since these are the prefixes declared for these namespaces in the underlying XSLT that will be generated for the mapping.
The function returns a boolean.
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