plone.app.discussion/plone/app/discussion/browser/comments.pt

<tal:block define="userHasReplyPermission view/can_reply;
                   isDiscussionAllowed view/is_discussion_allowed;
                   replies view/get_replies;
                   isAnon view/is_anonymous;
                   errors options/state/getErrors|nothing;"
           i18n:domain="plone">

    <div class="reply"
         tal:condition="isAnon">
        <form tal:attributes="action view/login_action">
            <input class="standalone"
                   style="margin-bottom: 1.25em;"
                   type="submit"
                   value="Log in to add comments"
                   i18n:attributes="value label_login_to_add_comments;"
                   />
        </form>
    </div>

    <div class="discussion"
         tal:condition="python:replies or (userHasReplyPermission and isDiscussionAllowed) or (isAnon and not userHasReplyPermission and isDiscussionAllowed)">
        <tal:getreplies repeat="reply_dict replies">

            <div class="comment"
                 tal:define="reply reply_dict/comment;
                             depth reply_dict/depth|python:0;
                             creator reply/Creator;
                             author_home_url string:${context/portal_url}/author/${reply/author_username};
                             portrait python: here.portal_membership.getPersonalPortrait(reply.author_username);
                             anonymous_creator python:creator in ('Anonymous User', '');"
                 tal:attributes="class python:'comment replyTreeLevel'+str(depth);
                                 style string:margin-left: ${depth}em;
                                 id string:comment-${reply/id}">

                <div class="commentImage" tal:condition="not:anonymous_creator">
                    <a href="" tal:condition="not:isAnon"
                               tal:attributes="href author_home_url">
                         <img src="defaultUser.gif"
                              alt=""
                              border="0"
                              width="75"
                              tal:attributes="src portrait/absolute_url;
                                              alt reply/creator" />
                    </a>
                    <img src="defaultUser.gif"
                         alt=""
                         border="0"
                         width="75"
                         tal:condition="isAnon"
                         tal:attributes="src portrait/absolute_url;
                                         alt reply/creator" />
                </div>

                <h3>
                    <a name="comments" tal:attributes="name reply/title">
                    <span tal:replace="reply/title">Comment title</span>
                    </a>
                </h3>

                <div class="documentByLine">
                        <tal:posted i18n:translate="label_comment_by">Posted by</tal:posted>
                        <tal:name condition="not:anonymous_creator">
                            <a href=""
                               tal:condition="not:isAnon"
                               tal:content="creator"
                               tal:attributes="href author_home_url">
                                Poster Name
                            </a>
                            <span tal:condition="isAnon"
                                  tal:replace="creator" />
                        </tal:name>
                        <tal:name i18n:translate="label_anonymous_user"
                                  condition="anonymous_creator">Anonymous User</tal:name>
                        <tal:at i18n:translate="label_commented_at">at</tal:at>
                    <span tal:replace="python:view.format_time(reply.modification_date)">8/23/2001 12:40:44 PM</span>
                </div>

                <div class="commentBody"
                     tal:content="structure reply/text">
                     This is the body text of the comment.
                </div>

                <a href="#" class="reply-to-comment-button" title="reply to this comment"
                   tal:condition="not:isAnon"
                   tal:attributes="onclick string:createReplyToCommentForm(${reply/id});
                                   id string:reply-to-comment-${reply/id}-button;
                                   href string:#comment-${reply/id}">
                    <img src="++resource++plone.app.discussion.images/reply.gif" />
                </a>

            </div>

        </tal:getreplies>
    </div>

    <div class="reply"
         tal:condition="python: isAnon and replies">
        <form tal:attributes="action view/login_action">
            <input class="standalone"
                   style="margin-bottom: 1.25em;"
                   type="submit"
                   value="Log in to add comments"
                   i18n:attributes="value label_login_to_add_comments;"
                   />
        </form>
    </div>

    <div class="reply"
         tal:condition="not:isAnon">

        <fieldset>

            <legend i18n:translate="legend_add_comment">Add comment</legend>
            <p i18n:translate="description_add_comment">
                You can add a comment by filling out the form below. Plain text
                formatting.
            </p>

            <form name="reply"
                  action=""
                  method="get"
                  tal:attributes="action string:${context/absolute_url}/++conversation++default/@@add-comment">

                <div class="field"
                     tal:define="error errors/subject|nothing;"
                     tal:attributes="class python: error and 'field error' or 'field'">

                    <label for="subject" i18n:translate="label_subject">Subject</label>

                    <span class="fieldRequired" title="Required"
                          i18n:attributes="title title_required;"
                          i18n:translate="label_required">(Required)</span>

                    <div tal:content="error">Validation error output</div>

                    <input name="subject"
                           id="subject"
                           value=""
                           size="40"
                           tal:attributes="value request/subject|request/title_override|nothing;" />

                </div>

                <div class="field"
                     tal:define="error errors/body_text|nothing;"
                     tal:attributes="class python: error and 'field error' or 'field'">

                    <label for="body_text" i18n:translate="label_comment">Comment</label>

                    <span class="fieldRequired" title="Required"
                          i18n:attributes="title title_required;"
                          i18n:translate="label_required">(Required)</span>

                    <div tal:content="error">Validation error output</div>

                    <textarea name="body_text"
                              id="body_text"
                              cols="40"
                              rows="8"
                              tal:content="request/body_text|request/text_override | nothing"></textarea>

                </div>

                <div class="formControls">

                    <input class="context"
                           type="submit"
                           value="Add Comment"
                           name="form.button.AddComment"
                           i18n:attributes="value label_add_comment;" />

                    <input class="standalone cancelreplytocomment"
                           type="submit"
                           name="form.button.Cancel"
                           value="Cancel"
                           i18n:attributes="value label_cancel;" />
                </div>

                <input type="hidden" name="form.submitted" value="1" />

            </form>
        </fieldset>
    </div>

</tal:block>