SaxonExtensionFunction

```
@Retention(RUNTIME)
@IndexAnnotated
public @interface SaxonExtensionFunction
```
An annotation for identifying classes that implement SaxonExtensionFunctions.
XML Calabash will automatically attempt to register any extension functions that so annotated.

Version:

1.0

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.String warnLevel
  A logging level hint.

- Element Detail
  - warnLevel
```
java.lang.String warnLevel
```
    A logging level hint. The warning level is a hint to the runtime processor about how agressively to report instantiation (and other errors). For completely standalone classes, it's reasonable to give quite assertive warnings (e.g. INFO). For classes that rely on third party libraries that may or may not be present, a less assertive warning (e.g. DEBUG) might be more reasonable.
    
    Returns:
    
    the warning level
    
    Default:
    
    "INFO"