Move.php

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<?php
namespace Magento\Framework\View\Layout\Reader;

use Magento\Framework\View\Layout;

class Move implements Layout\ReaderInterface
{
    const TYPE_MOVE = 'move';
    public function getSupportedNodes()
    {
        return [self::TYPE_MOVE];
    }

    public function interpret(Context $readerContext, Layout\Element $currentElement)
    {
        $this->scheduleMove($readerContext->getScheduledStructure(), $currentElement);
        return $this;
    }

    protected function scheduleMove(Layout\ScheduledStructure $scheduledStructure, Layout\Element $currentElement)
    {
        $elementName = (string)$currentElement->getAttribute('element');
        $destination = (string)$currentElement->getAttribute('destination');
        $alias = (string)$currentElement->getAttribute('as') ?: '';
        if ($elementName && $destination) {
            list($siblingName, $isAfter) = $this->beforeAfterToSibling($currentElement);
            $scheduledStructure->setElementToMove(
                $elementName,
                [$destination, $siblingName, $isAfter, $alias]
            );
        } else {
            throw new \Magento\Framework\Exception\LocalizedException(
                new \Magento\Framework\Phrase('Element name and destination must be specified.')
            );
        }
        return $this;
    }

    protected function beforeAfterToSibling($node)
    {
        $result = [null, true];
        if (isset($node['after'])) {
            $result[0] = (string)$node['after'];
        } elseif (isset($node['before'])) {
            $result[0] = (string)$node['before'];
            $result[1] = false;
        }
        return $result;
    }
}