| Interface | Description | 
|---|---|
| StringConcatenationClient.TargetStringConcatenation | 
 A  
StringConcatenationClient.TargetStringConcatenation models the public interface of a
 StringConcatenation so implementations of the StringConcatenationClient
 can append their content properly. | 
| Class | Description | 
|---|---|
| StringConcatenation | 
 
 A  
StringConcatenation allows for efficient, indentation aware concatenation of character sequences. | 
| StringConcatenationClient | 
 A callback object that allows to reuse an existing  
StringConcatenation
 to append content to it. |