How to use Google's Organisation Logo Schema.org markup with WordPress Theme Logo

function.php

function mytheme_setup() {
    add_theme_support('custom-logo');
}

add_action('after_setup_theme', 'mytheme_setup');

logo_schema.html

<div itemscope itemtype="http://schema.org/Organization">
  <a itemprop="url" href="http://www.yourdomain.co.uk/">
    <img itemprop="logo" src="http://www.yourdomain.co.uk/logo.png" alt="Company name" />
  </a>
</div>

logo_schema_wordpress.php

<div itemscope itemtype="http://schema.org/Organization">
  <?php if ( function_exists( 'the_custom_logo' ) ) {
    the_custom_logo();
  } ?>
</div>

logo_schema_wordpress_example_output.html

<div itemscope itemtype="http://schema.org/Organization">
  <a href="https://www.thewirelessguy.co.uk/" class="custom-logo-link" rel="home" itemprop="url" tabindex="0">
    <img width="249" height="56" src="https://www.thewirelessguy.co.uk/wp-content/uploads/2016/05/logo.png" class="custom-logo" alt="The Wireless Guy logo" itemprop="logo">
  </a>
</div>