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Classes in gnu.jel used by gnu.jel 
| Class | Description |  
| ClassFile | This class represents a classfile image in JEL. |  
| CompilationException | Represents an error encountered during the compilation. |  
| CompiledExpression | This abstract class is a superclass of every JEL-compiled expression,
 each of which overrides some of the abstract methods below. |  
| DVMap | Provides the information about defined dynamic variables. |  
| Library | A namespace for JEL expressions. |  
| LocalField | Represents a field local to the class being compiled. |  
| LocalMethod | Represents a method local to the class being compiled. |  
| OP | A tree node, representing an operation. |