Basic_Custom_Capability.md

4. How to define a custom capability?

In the previous example, we used the default capability tosca.capabilities.Endpoint.Database, which has the some default properties: port, protocol as in Figure 2:

Figure 1: Default properties of an endpoint capability

To add more properties to a capability, or to set a default value to a capability, we define a custom one as follows:

capability_types:
  # define a custom capability
  tosca.capabilities.Endpoint.Database.Mongo:
    derived_from: tosca.capabilities.Endpoint.Database
    properties:
      port:
        type: integer
        default: 27017

Here, the custom capability tosca.capabilities.Endpoint.Database.Mongo inherits all properties from the parent type tosca.capabilities.Endpoint.Database and set the port property to the default value 27017.

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