What is the Inline Editing Command for empty fields?

Question

A colleague pointed out the XPM documentation suggests outputting an empty TCDL tag allows authors the ability to edit fields which are not rendered.

2011

<!-- TemplateBeginIf cond="CollectionLength('Field.Values') == 0" -->
 <tcdl:ComponentField name="${Field.Name}"></tcdl:ComponentField>
<!-- TemplateEndIf -->

2013

@@FieldStartMarker(Fields.Address.HouseNumberAddition)@@
  @@FieldValueStartMarker()@@
  @@FieldValueEndMarker()@@
@@FieldEndMarker()@@

What's the equivalent XPM inline editing comment syntax for these?

I'm posting an example below for reference. We've seen questions on making empty fields editable (https://stackoverflow.com/q/12050672/395495), but I wasn't sure of the JSON comment syntax.

Answer 1

For this source (note summary field is missing):

<Content xmlns="http://Electridion.com/Schema/Article" xmlns:xlink="http://www.w3.org/1999/xlink">
    <title>Electridion Events</title>
    <description>Description</description>
</Content>

In 2013, I used:

@@FieldStartMarker('summary')@@
  @@FieldValueStartMarker()@@
  @@FieldValueEndMarker()@@
@@FieldEndMarker()@@

Source on Staging:

<span>
  <!-- Start Component Field: {"XPath":"tcm:Content/custom:Content/custom:summary[1]"} -->
</span>

TCDL equivalent in Template Builder:

<tcdl:Field xPath="tcm:Content/custom:Content/custom:summary" itemId="tcm:69-6362-v0">
  <span><!-- Start Component Field: {"XPath":"tcm:Content/custom:Content/custom:summary[1]"} --><tcdl:FieldValue index="0">
  </tcdl:FieldValue></span>
</tcdl:Field>

So it seems the XPath is as it would be if there was a value in the field. All this needs is a check to only output the empty markup if the field is actually empty.