XSL file is not included

I'm implementing sitemap in laravel 5.7 but there is one file which I want to include in blade file but XSL file is not including

File which I want to include: xsl/gss.xsl

Below my sitemap.blade.php file

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href=""?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"  
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
  xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">

    @foreach($urls as $url)
        <sitemap>
            <loc>
                
            </loc>
            @if(isset($url['lastmod']))
                <lastmod></lastmod>
            @endif
        </sitemap>
    <br>
    @endforeach
</sitemapindex>

So anyone has an idea regarding sitemap in laravel 5.7 ??

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