title: What is it called when a key in a key value pair loses it's meaning?
body: <p>Let's say I have a feed of data in the form of key-value pairs. This feed comes from multiple sources which provide additional fields and also reuse similar fields to mean different things. </p>
  
  <p>An issue occurs when you try to extract meaning from a data set made from both sources using these similar fields.</p>
  
  <p>What is this phenomenon called? </p>
  
  <p>Example from source <code>A</code>:</p>
  
  <p>{ name: 'building A', ... }</p>
  
  <p>Example from source <code>A-firewall-events</code></p>
  
  <p>{ name: 'rejected', ip: '...', ... }</p>