I have a layout that gives me the choice of either:
- including the sidebar within the article tag, even though it's not specific to the article
 - having the title outside the article tag
 
Currently I have the title outside the article tag, but the validator tells me that the itemprop="headline" isn't part of any item.
What would be the best way to structure this? Is there a for attribute for relating a title with an article?
If you're wondering what type of layout would force me to make this choice, it's a full-width heading section, then article and sidebar below.
Edit
Simplified code
<div class="page-wrap">
    <header class="article-header" itemprop="headline">
        <h1>This heading section spans the width of the page</h1>
    </header>
    <div class="content-wrap">
        <nav class="submenu">
            <p>The submenu is here in the markup so that it appears above the content on mobiles, but it gets pulled to the side on wider screens.</p>
        </nav>
        <article class="content">
            <p>Article content...</p>
        </article>
        <aside class="sidebar">
            <p>This sidebar is not related specifically to the article on the page.</p>
        </aside>
    </div><!-- .content-wrap -->
</div><!-- .page-wrap -->