xsl:on-completion
Occurs within xsl:iterate to define processing to be carried out when the input sequence is exhausted.
Content: sequence-constructor
Permitted parent elements: 
         xsl:iterate
      
Attributes
| 
 | 
 | The effect of the instruction may be defined
                    either by an expression within the optional  | 
Saxon availability
Available in XSLT 3.0. From Saxon 9.8, available in all editions. Implemented in Saxon-PE and Saxon-EE since Saxon 9.6. Available for all platforms.
Notes on the Saxon implementation
The rule that xsl:on-completion executes with no context item was
                first implemented in Saxon 9.8.
In earlier working drafts of XSLT 3.0, the xsl:on-completion element came
                last in the body of the xsl:iterate instruction. This caused problems with
                    the scope of local variables, so in the final Recommendation, xsl:on-completion comes
                first. The new rule was implemented in Saxon 9.7. The spec has also changed to clarify that 
                    xsl:on-completion is evaluated if the input sequence to xsl:iterate is empty.
Details
During execution of xsl:on-completion there is no context item,
                    position or size; the instruction has access to the iteration parameters with
                    the values given on the last iteration (or the initial values of the
                        xsl:param elements if the input sequence was empty). For
                    further details see xsl:iterate.