[TAMAYA-355] Revise mapping of xml, json and yaml configurations to honor lists

• Type: Improvement
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.3-incubating
• Fix Version/s: 0.4-incubating
• Component/s: Core, Extensions
• Assignee: Anatole Tresch
• Reporter: Anatole Tresch
• Created: 27/Sep/18 18:08
• Updated: 06/Jan/19 23:30
• Resolved: 06/Jan/19 23:30

Description

Given the following config:

<config>
  <a>
    <b>23</b>
  </a>
  <a>
    <b>15</b>
  </a>
</config>

The current mapping (in core, and the format related modules) results in a.b=15, which is invalid, because it actually looses information.
This is basically similar for other formats. This change defines that list entries are mapped to arrays as follows:

a[0].b=23
a[1].b=15

This syntax does not loose information and is simple enough to reestablish access logic such as 

List<Map<String,String>> as = configuration.query(ListQuery.of("a"));