Queestion about postional predicates de-mystified

  <xsl:value-of select="for $e in ancestor::node()
                            return if-absent(name($e), '')"
                separator="/" />

My apologies for the ignorance but are re the for, if-absent, return and
separator clauses part of Xpath 2.0 or XSLT 2.0 or XQUERY

Thx,

Carlos


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