https://openjdk.java.net/ 
public interface com.sun.xml.internal.ws.api.model.wsdl.WSDLExtension
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.xml.internal.ws.api.model.wsdl.WSDLExtension
  super_class: java.lang.Object
{
  public abstract javax.xml.namespace.QName getName();
    descriptor: ()Ljavax/xml/namespace/QName;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "WSDLExtension.java"