ass="o">=</span> <span class="n">summary_importance</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_metadata</span> <span class="o">=</span> <span class="p">{</span><span class="s1">&#39;version&#39;</span><span class="p">:</span> <span class="n">version</span> <span class="k">if</span> <span class="n">version</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">_SchemaVersions</span><span c