anchor.diff:  zero-padded values from the slot's scheduled time.
   
   `year`, `month`, `day`, `hour`, `minute`, and `second` will also be
  -set as Oozie properties, so they can be used in the workflow.xml.
  +set as Oozie properties, so they can be used in the Oozie workflow XML
  +file.
   
   Additionally, Celos will set the Oozie property `celosWorkflowName` to
   a string like "my-workflow@2015-09-12T20:00Z", useful for display.
  
positive.code: 
  _The Celos UI_
  
  === Oozie
  
  Celos works as a frontend to the
  link:https://oozie.apache.org/[_Apache Oozie_] execution engine.
  
negative.code: [source,javascript]
  ....
  celos.oozieExternalService({
      "oozie.wf.application.path": "/workflow-dir/workflow.xml",
      "prop1": "Hello. It is the year ${year}!",
      "prop2": "Just another property."
  });
  ....
  
  ===== Note
  
  `oozie.wf.application.path` is the only property required by Oozie.
  It points to a
  link:https://oozie.apache.org/docs/4.2.0/WorkflowFunctionalSpec.html[Oozie
  workflow XML file] within an Oozie workflow directory.  There can be
  multiple XML files within a single Oozie workflow directory.
  
  === Variables
  
  