public interface VelocityExpression

An expression in the Velocity Template Language (VTL). For more information on Smart GWT's Velocity support, see Velocity support.

Note that a VelocityExpression must often evaluate to a particular type of value to be useful. For example, DataSource.requires must evaluate to true or false (Boolean objects or strings containing those two words), and Mail.messageData must evaluate to a Java Map object, or a Java List containing only Maps.