This post assumes that you have an MPS with mbeddr preloaded.

Go to the constraints aspect for the concept you want to add a default to a property:

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Create a new constraint for this concept:

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Press Ctrl+L and import the language com.mbeddr.mpsutil.propertydefault:

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Go to the property constraints and press Enter to make a new one:

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Choose the property to which you want to apply a default value:

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Select the entire constraint by pressing ctrl + uparrow twice:

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Press Ctrl + Space and choose default to convert the constraint to a default specification:

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Choose your default value:

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If you now make an instance of MyConcept, you will automatically get the myProperty filled in with the default value:

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