title: GraphQL Schema Connection for a list in Gatsby
body: <p>I'm using <code>createSchemaCustomization</code> in <code>gatsby-node</code> to create schema connections. This works great for things like this:</p>
  <pre><code>type BoxesYaml implements Node {
    products: [Product] @link(by: &quot;id&quot;)
  }
  </code></pre>
  <p>where <code>Product</code> is a type, and <code>BoxesYaml</code> has a <code>product</code> array containing <code>product</code> IDs as part of the YAML.</p>
  <p>Now, I'd like to do the same for a YAML file which contains <em><strong>only</strong></em> a sequence. For example:</p>
  <pre><code>- product1
  - product2
  - product3
  </code></pre>
  <p>Is it possible to connect these IDs to a <code>Product</code> type in Gatsby?</p>
  <p>I have tried various attempts at defining the array of products at <code>Products</code> but so far have only been able to generate syntax errors.</p>
  <p>Something along the lines of</p>
  <pre><code>type BoxesYaml implements [Product] @link(by: &quot;id&quot;)
  </code></pre>