 class="nam">fields</span><span class="op">.</span><span class="nam">String</span><span class="op">(</span><span class="nam">attribute</span><span class="op">=</span><span class="str">'kb_items.content'</span><span class="op">,</span> <span class="nam">required</span><span class="op">=</span><span class="key">True</span><span class="op">,</span> <span class="nam">description</span><span class="op">=</span><span class="str">'Knowledge base content'</span><span class="op">)</span><span class="op">,</span><spa