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Watson supports the following built in entities:

Entity Name Binding Type
sys-currency float
sys-date DateTime
sys-location string
sys-number int or float
sys-percentage int or float
sys-person string
sys-time DateTime

These entity assets are already created for you (in the System/Watson folder). You can use them in any of your intents just like other entities.

To get the value of a system entity at runtime, use the SystemValue property on the LexiconEntityMatch. Then call SystemValue.StringValue, SystemValue.FloatValue, etc.