The xml_node->extractone] method is used to return the first of a set of child elements with the given tag name.
This method has one required parameter, the tag name to extract. If the requested tag is present [xml_node->extractone] returns the entire xml_element, if not it returns void.
xml_node->extractone( 'child_tag_name' )
This example uses the [xml_node->extractone] method to retrieve the first "date" element from the "month" node.
var(aMonth = xml('<month> <data> <name>March</name> <date type="lastDay">31</date> </data> <date>4</date> <date>11</date> <date>16</date> <date>23</date> <date>30</date> </month>') ) $aMonth->extractone('date')
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