-term">term</a> <span class="arrow">&#45;&gt;</span></span> <span class="xref-unresolved">Base</span>.Sexp.t</span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-mk_composite_base_type" class="anchored"><a href="#val-mk_composite_base_type" class="anchor"></a><code><span><span class="keyword">val</span> mk_composite_base_type : 
  <span>?prefix:<span class="xref-unresolved">Base</span>.String.t <span class="arrow">&#45;&gt;</span></span>
  <span>ctx:<a href="Context/index.html#typ