To test for the existence of an attribute in an xml_element

This example uses the [xml_element->hasattribute] method to verifiy that the 'vacation' xml_element has the weekday element. if not it uses the day and month attributes to set it.

Code

var(vacationDays = xml('<vacation day="23" month="March">
     <employee>Sean</employee>
</vacation>') )

if( !$vacationDays->hasattribute('weekday') ) => {^ 
     local( 'weekday' = date($vacationDays->getattribute('month')+' '+$vacationDays->getattribute('day')+' '+date->year, -format="%B %d %Y") )
     $vacationDays->setattribute('weekday', #weekday->format("%A"))
^}

 'weekday is '+$vacationDays->getattribute('weekday')

Result

weekday is Wednesday