Config.php

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<?php
namespace Magento\Framework\View\PageLayout;

class Config extends \Magento\Framework\Config\AbstractXml
{
    protected $urnResolver;

    public function __construct(
        $configFiles,
        \Magento\Framework\Config\DomFactory $domFactory,
        \Magento\Framework\Config\Dom\UrnResolver $urnResolver
    ) {
        $this->urnResolver = $urnResolver;
        parent::__construct($configFiles, $domFactory);
    }

    public function getSchemaFile()
    {
        return $this->urnResolver->getRealPath('urn:magento:framework:View/PageLayout/etc/layouts.xsd');
    }

    public function getPageLayouts()
    {
        return $this->_data;
    }

    public function hasPageLayout($pageLayout)
    {
        return isset($this->_data[$pageLayout]);
    }

    public function getOptions()
    {
        return $this->getPageLayouts();
    }

    public function toOptionArray($withEmpty = false)
    {
        $options = [];
        foreach ($this->getPageLayouts() as $value => $label) {
            $options[] = ['label' => $label, 'value' => $value];
        }

        if ($withEmpty) {
            array_unshift($options, [
                'value' => '',
                'label' => (string)new \Magento\Framework\Phrase('-- Please Select --')
            ]);
        }
        return $options;
    }

    protected function _extractData(\DOMDocument $dom)
    {
        $result = [];

        foreach ($dom->getElementsByTagName('layout') as $layout) {
            $result[$layout->getAttribute('id')] = trim($layout->nodeValue);
        }
        return $result;
    }

    protected function _getInitialXml()
    {
        return '<?xml version="1.0" encoding="UTF-8"?>'
            . '<page_layouts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></page_layouts>';
    }

    protected function _getIdAttributes()
    {
        return [
            '/page_layouts/layout' => 'id'
        ];
    }
}