http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
class org.apache.fop.util.XMLResourceBundle$2 implements java.util.Enumeration
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.apache.fop.util.XMLResourceBundle$2
  super_class: java.lang.Object
{
  private java.util.Enumeration local;
    descriptor: Ljava/util/Enumeration;
    flags: (0x0002) ACC_PRIVATE

  private java.util.Enumeration pEnum;
    descriptor: Ljava/util/Enumeration;
    flags: (0x0002) ACC_PRIVATE

  private java.lang.Object nextElement;
    descriptor: Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE

  final org.apache.fop.util.XMLResourceBundle this$0;
    descriptor: Lorg/apache/fop/util/XMLResourceBundle;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(org.apache.fop.util.XMLResourceBundle);
    descriptor: (Lorg/apache/fop/util/XMLResourceBundle;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.fop.util.XMLResourceBundle$2 this
         0: .line 276
            aload 0 /* this */
            aload 1
            putfield org.apache.fop.util.XMLResourceBundle$2.this$0:Lorg/apache/fop/util/XMLResourceBundle;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 277
            aload 0 /* this */
            aload 1
            invokevirtual org.apache.fop.util.XMLResourceBundle.getLocalKeys:()Ljava/util/Enumeration;
            putfield org.apache.fop.util.XMLResourceBundle$2.local:Ljava/util/Enumeration;
         2: .line 278
            aload 0 /* this */
            aload 1
            invokestatic org.apache.fop.util.XMLResourceBundle.access$0:(Lorg/apache/fop/util/XMLResourceBundle;)Ljava/util/ResourceBundle;
            invokevirtual java.util.ResourceBundle.getKeys:()Ljava/util/Enumeration;
            putfield org.apache.fop.util.XMLResourceBundle$2.pEnum:Ljava/util/Enumeration;
         3: .line 276
            return
        end local 0 // org.apache.fop.util.XMLResourceBundle$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/apache/fop/util/XMLResourceBundle$2;
    MethodParameters:
        Name  Flags
      this$0  final

  private boolean findNext();
    descriptor: ()Z
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.fop.util.XMLResourceBundle$2 this
         0: .line 283
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.nextElement:Ljava/lang/Object;
            ifnull 6
         1: .line 284
            iconst_1
            ireturn
         2: .line 287
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.pEnum:Ljava/util/Enumeration;
            invokeinterface java.util.Enumeration.nextElement:()Ljava/lang/Object;
            astore 1 /* next */
        start local 1 // java.lang.Object next
         3: .line 288
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.this$0:Lorg/apache/fop/util/XMLResourceBundle;
            getfield org.apache.fop.util.XMLResourceBundle.resources:Ljava/util/Properties;
            aload 1 /* next */
            invokevirtual java.util.Properties.containsKey:(Ljava/lang/Object;)Z
            ifne 6
         4: .line 289
            aload 0 /* this */
            aload 1 /* next */
            putfield org.apache.fop.util.XMLResourceBundle$2.nextElement:Ljava/lang/Object;
         5: .line 290
            iconst_1
            ireturn
        end local 1 // java.lang.Object next
         6: .line 286
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.pEnum:Ljava/util/Enumeration;
            invokeinterface java.util.Enumeration.hasMoreElements:()Z
            ifne 2
         7: .line 293
            iconst_0
            ireturn
        end local 0 // org.apache.fop.util.XMLResourceBundle$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lorg/apache/fop/util/XMLResourceBundle$2;
            3    6     1  next  Ljava/lang/Object;

  public boolean hasMoreElements();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.fop.util.XMLResourceBundle$2 this
         0: .line 297
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.local:Ljava/util/Enumeration;
            invokeinterface java.util.Enumeration.hasMoreElements:()Z
            ifeq 2
         1: .line 298
            iconst_1
            ireturn
         2: .line 300
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual org.apache.fop.util.XMLResourceBundle$2.findNext:()Z
            ireturn
        end local 0 // org.apache.fop.util.XMLResourceBundle$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/fop/util/XMLResourceBundle$2;

  public java.lang.Object nextElement();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.fop.util.XMLResourceBundle$2 this
         0: .line 304
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.local:Ljava/util/Enumeration;
            invokeinterface java.util.Enumeration.hasMoreElements:()Z
            ifeq 2
         1: .line 305
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.local:Ljava/util/Enumeration;
            invokeinterface java.util.Enumeration.nextElement:()Ljava/lang/Object;
            areturn
         2: .line 307
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual org.apache.fop.util.XMLResourceBundle$2.findNext:()Z
            ifeq 6
         3: .line 308
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.nextElement:Ljava/lang/Object;
            astore 1 /* result */
        start local 1 // java.lang.Object result
         4: .line 309
            aload 0 /* this */
            aconst_null
            putfield org.apache.fop.util.XMLResourceBundle$2.nextElement:Ljava/lang/Object;
         5: .line 310
            aload 1 /* result */
            areturn
        end local 1 // java.lang.Object result
         6: .line 313
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.fop.util.XMLResourceBundle$2.pEnum:Ljava/util/Enumeration;
            invokeinterface java.util.Enumeration.nextElement:()Ljava/lang/Object;
            areturn
        end local 0 // org.apache.fop.util.XMLResourceBundle$2 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    this  Lorg/apache/fop/util/XMLResourceBundle$2;
            4    6     1  result  Ljava/lang/Object;
}
SourceFile: "XMLResourceBundle.java"
EnclosingMethod: org.apache.fop.util.XMLResourceBundle.getKeys:()Ljava/util/Enumeration;
NestHost: org.apache.fop.util.XMLResourceBundle
InnerClasses:
  org.apache.fop.util.XMLResourceBundle$2