## net.sf.saxon.functions
Interface ExtensionFunctionFactory

All Known Implementing Classes:
  JavaExtensionFunctionFactory

    public interface ExtensionFunctionFactory

This is a marker interface representing an abstract superclass of JavaExtensionFunctionFactory and DotNetExtensionFunctionFactory. These play equivalent roles in the system: that is, they are responsible for determining how the QNames of extension functions are bound to concrete implementation classes; but they do not share the same interface.

This interface was introduced in Saxon 8.9. Prior to that, `ExtensionFunctionFactory` was a concrete class - the class now named `JavaExtensionFunctionFactory`.

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