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At DataModels, What's the difference between 'timestamp' and 'dateModified'?

In some datamodels are used 2 different attribute name to represent time instant, timestamp or dateModified.

For exemple on Device datamodel the attribute batteryLevel are used timestamp and on configuration, dateModified.

dateModified : It captures the last modification timestamp of this attribute.

timestamp: Timestamp when the last update of the attribute happened. This value can also appear as a FIWARE TimeInstant

It's sounds quite similar. The difference between this two attributes justify use a two different names?

Check for the existence of the same attribute on any of the other models and reuse it, if pertinent.