| Interface | Description | 
|---|---|
| EnableAttribute | This interface is used by Ant attributes. | 
| Class | Description | 
|---|---|
| AttributeNamespace | This class is used to indicate that the XML namespace (URI)
 can be used to look for namespace attributes. | 
| BaseIfAttribute | An abstract class for if/unless attributes. | 
| IfBlankAttribute | Check if an attribute is blank or not. | 
| IfBlankAttribute.Unless | The unless version | 
| IfSetAttribute | Check if an attribute value as a property is set or not | 
| IfSetAttribute.Unless | The unless version | 
| IfTrueAttribute | Check if an attribute value is true or not. | 
| IfTrueAttribute.Unless | The unless version |