Hierarchical data


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Example 1. Aggregated record as a hierarchy:

travel id=t1
- date: 2019-05-15
- reason: Customer meeting in Oslo
- employee name: Ola Nordmann
- transactions
  - bus ticket - 100 NOK
  - accommodation - 1000 NOK

Example 2. Serialized as XML:

<travel id="t1">
   <date>2019-05-15</date>
   <reason>Customer meeting in Oslo</reason>
   <employee id="e1">
       <first-name>Ola</first-name>
       <second-name>Nordmann</second-name>
   </employee>
   <transactions>
       <transaction id="c1">
           <item-name>bus ticket</item-name>
           <cost currency="NOK">100</cost>
       </transaction>
       <transaction id="c2">
           <item-name>accommodation</item-name>
           <cost currency="NOK">1000</cost>
       </transaction>
   </transactions>
</travel>

A hierarchical (XML) database can store records like this, and a thin app then should only filter the records relevant to the user and render it.