Services markup: "{}" versus {}

How come both of these markups work for executing Services? (executes without quotation marks)
If this is a python property, where else it applies?

rosservice call /service_demo β€œ{}”
rosservice call /service_demo {}

Thank you :seedling:

Hello @sofie.iommi.001

Well in this case it works because it’s an empty message, but for more complex message you will need to specify the β€œβ€, so it is recommended to always use them.

Best,

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