TOSCA provides for a set of functions to reference elements within the template or to retrieve runtime values.
Below is a list of supported expressions
The get_input function is used to retrieve the values of properties declared within the inputs section of a TOSCA Service Template.
The get_property function is used to retrieve property values between modelable entities defined in the same service template.
The get_attribute function is used to retrieve the values of named attributes declared by the referenced node or relationship template name.
The get_operation_output function is used to retrieve the values of variables exposed / exported from an interface operation.
The get_artifact function is used to retrieve artifact location between modelable entities defined in the same service template.