iases/identity/id/"><code>Id</code></a> of the <a href="/api/relationships/type-aliases/concept/relationship/"><code>Relationship</code></a>.</p></td></tr><tr><th><code>firstRowId</code></th><td><code><span class="builtin">string</span></code></td><td><p>The <a href="/api/common/type-aliases/identity/id/"><code>Id</code></a> of the first <a href="/api/store/type-aliases/store/row/"><code>Row</code></a> in the linked list <a href="/api/relationships/type-aliases/concept/relationship/"><code>Relationship</cod