Specify the size of all the parameters, state, inputs or outputs. Modelica String assignation. The default value is specified to ease serialization. Partial tree of a structured content. Each node of a this type must not be a leaf. Terminal node of a {@link Struct} tree. This node is always a leaf. Describe an output of the modelica world. Root of the modelica tree. Describe any model identifier. Wrapper around the implicit (and inputs) variables list. Wrapper around the explicit variables list. Wrapper around the {@link Output} list.