| Name | Description | Type | Package | Framework |
| FlowVariablePortObject | A singleton port object representing a variable input. | Class | org.knime.core.node.port.flowvariable | KNIME |
| FlowVariablePortObject .Serializer | Serializer for this port object. | Class | org.knime.core.node.port.flowvariable | KNIME |
| FlowVariablePortObjectSpec | Spec to the FlowVariablePortObject. | Class | org.knime.core.node.port.flowvariable | KNIME |
| FlowVariablePortObjectSpec .Serializer | Serializer for FlowVariablePortObjectSpecs. | Class | org.knime.core.node.port.flowvariable | KNIME |