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Component parameters are the primary means for a component instance and its container to communicate with each other. Parameters are used to configure component instances.
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A component may have any number of parameters. Each parameter has a specific name, a specific Java type (which may be a primitive value), and may be optional or required.
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In Tapestry, a parameter is not a slot into which data is pushed: it is a connection between a field of the component (marked with the @Parameter annotation) and a property or resource of the component's container. (Components can be nested, so the container can be either the page or another component.)
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The connection between a component and a property (or resource) of its container is called a binding. The binding is two-way: the component can read the bound property by reading its parameter field. Likewise, a component that updates its parameter field will update the bound property.
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