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Missing, null and empty string

  • 16 September 2016
  • 1 reply
  • 230 views

Hello, Im still thinking about differences between attribute status... I understand difference between empty string value of attribute and null value of attribute, but what does "missing" value of attribute really mean please?

Thank You so much for explain!

1 reply

Userlevel 5

Missing means that the attribute does not exist at all on that feature.

More info on FME null handling here: https://knowledge.safe.com/articles/21423/how-does-fme-handle-null-attribute-values.html

In short:

  • Empty – The attribute exists and has an empty string as its value.
  • Null – The attribute exists and has a value of null.
  • Missing – The attribute does not exist.

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