ocument.
</p>
<types>
  <type name="AddContentOverlay">
    <p>
      A directive to begin overlaying the contents of a file. The supplied
      content will be used for analysis in place of the file contents in the
      filesystem.
    </p>
    <p>
      If this directive is used on a file that already has a file content
      overlay, the old overlay is discarded and replaced with the new one.
    </p>
    <object>
      <field name="type" value="add">
        <ref>String</ref>
      </field>
      <fiel