Spring Expression Language (SpEL) is an expression language used in the Spring Framework for evaluating and manipulating objects, properties, and
conditions within Spring-based applications.
org.springframework.ui.Model is an interface in the Spring Framework that represents a container for data that can be passed between a
controller and a view in a Spring MVC web application, allowing for data sharing during the request-response cycle.
Attributes added to the org.springframework.ui.Model should follow the Java identifier naming convention, which means they must start
with a letter a-z, A-Z, underscore _, or a dollar sign $ and may be followed by letters, digits, underscores,
or dollar signs.
Failure to do so may result in SpEL parsing errors when using these attributes in template engines.
