app:
     servers:
        db:
          host:     db.domain.com
          username: username
          password: password
        email:
          host:     mail.domain.com
          etc

##</code><code>##

      app:
        servers:
          db:
             host:  dev.domain.com
          email:
             host:  dev.domain.com


##</code><code>##


    main:
        cronjobs:
           - job1
           - job2
           - job3
           - job4
           - job5

##</code><code>##

    main:
      cronjobs:
         '!' :                        # key '!' must exist to signal merge
             '-' :                    # delete elements 3 and 5
                 - 3
                 - 5
             '+' :                    # append jobs 6 and 7
                 - job6
                 - job7
          OR 
             '+' :                    # insert job8 at index 2, job9 at index 5
                 2: job8
                 5: job9

         1:  job10                    # change index1 from job2 to job10