The <nestedPath> tag supports and assists with nested beans or
bean properties in the model. Exports a "nestedPath" variable of type String
in request scope, visible to the current page and also included pages, if any.
The BindTag will auto-detect the current nested path and automatically
prepend it to its own path to form a complete path to the bean or bean property.
This tag will also prepend any existing nested path that is currently set.
Thus, you can nest multiple nested-path tags.
Set the path that this tag should apply. E.g. 'customer' to allow bind
paths like 'address.street' rather than 'customer.address.street'.