| Name | Description | Type | Package | Framework |
| DefaultExpressionManager | Custom functions can be added using configuration elements: | Class | org.apache.cocoon.forms.expression | Apache Cocoon | |
| ExpressionManager | Work interface for the component that creates Expression objects. | Interface | org.apache.cocoon.forms.expression | Apache Cocoon |
| IsNullFunction | Returns true if argument is null. | Class | org.apache.cocoon.forms.expression | Apache Cocoon |
| NullFunction | Returns null constant. | Class | org.apache.cocoon.forms.expression | Apache Cocoon |
| StringFunction | Converts argument to the string. | Class | org.apache.cocoon.forms.expression | Apache Cocoon |
| SumFunction | Sum function. | Class | org.apache.cocoon.forms.expression | Apache Cocoon |