Current text is:

 

• Add second given (middle) name to the example above, and write equivalent rules using soft indexing:
  * name[+].given[+] = "Robert"
  * name[+].given[+] = "David"
  * name[=].family = "Smith"
  ...

I believe the second line of the example should be:

• name[=].given[+] = "David"

(should use "=" instead of "+" for name index.