Defining a simple design dialog for configuring a component's content policies

design_dialog.xml

<cq:design_dialog jcr:primaryType="nt:unstructured" jcr:title="Embed" sling:resourceType="cq/gui/components/authoring/dialog" jcr:description="Content policy for embedding content">
  <content jcr:primaryType="nt:unstructured" sling:resourceType="granite/ui/components/coral/foundation/container">
    <items jcr:primaryType="nt:unstructured">
      <tabs jcr:primaryType="nt:unstructured" maximized="true" sling:resourceType="granite/ui/components/coral/foundation/tabs">
        <items jcr:primaryType="nt:unstructured">
          <properties jcr:primaryType="nt:unstructured" jcr:title="Main" margin="true" sling:resourceType="granite/ui/components/coral/foundation/fixedcolumns">
            <items jcr:primaryType="nt:unstructured">
              <content jcr:primaryType="nt:unstructured" margin="false" sling:resourceType="granite/ui/components/coral/foundation/container">
                <items jcr:primaryType="nt:unstructured">
                  <allowedSites jcr:primaryType="nt:unstructured" fieldDescription="If you set a value here, only pages from the listed sites can be embedded." fieldLabel="Allowed sites" sling:resourceType="granite/ui/components/coral/foundation/form/multifield">
                    <field jcr:primaryType="nt:unstructured" name="./allowedSites" required="true" sling:resourceType="granite/ui/components/coral/foundation/form/textfield"/>
                  </allowedSites>
                </items>
              </content>
            </items>
          </properties>
        </items>
      </tabs>
    </items>
    </content>
</cq:design_dialog>