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Under the covers, expansions are the same as parameter bindings. The default binding prefix for expansions is "prop:" (that is, the name of a property or a property expression), but other binding prefixes are useful, especially "message:" (to access a localized message from the component's message catalog).

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Embedded components may have two Tapestry-specific parameters:

• id: A unique id for the component (within its container).
• mixins: An optional comma separated list of mixins for the the component.

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Any other attributes are used to bind parameters of the component. These may be formal parameters or informal parameters. Formal parameters will have a default binding prefix (usually "prop:"). Informal parameters will be assumed to be literals (i.e., the "literal:" binding prefix).

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