Add nested example for Section 12.2.4. Reference and content elements have same meaning

[cdmgtri]

12.2.4. Reference and content elements have same meaning

This section explains that relationships established via nested elements and via references are semantically equivalent. The two examples given, Figure 12-4 and Figure 12-5, show the semantic equivalence between forward and backward references.

Figure 12-4: Example with a backward reference Figure 12-5: Example with a forward reference

A purely nested example is not given.

Suggest adding a third example with no reference at all:

<j:Witness>
  <nc:RoleOfPerson>
    <nc:PersonName>
      <nc:PersonFullName>John Doe</nc:PersonFullName>
    </nc:PersonName>
  </nc:RoleOfPerson>
</j:Witness>