Expression object that offers the functionality of Spring MVC's RequestDataValueProcessor for
performing last-moment modifications to request data values such as URLs or form contents in order to
enable mechanism such as CSRF protection.
Implementation of Thymeleaf's IThymeleafEvaluationContext interface designed to wrap around a
delegated implementation of EvaluationContext, adding the
Thymeleaf-required PropertyAccessor implementations and (optionally)
a series of variables to be accessed like #variableName during expression evaluation.