https://openjdk.java.net/ 
public interface com.sun.org.apache.xml.internal.security.signature.reference.ReferenceNodeSetData extends com.sun.org.apache.xml.internal.security.signature.reference.ReferenceData
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.org.apache.xml.internal.security.signature.reference.ReferenceNodeSetData
  super_class: java.lang.Object
{
  public abstract java.util.Iterator<org.w3c.dom.Node> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/Iterator<Lorg/w3c/dom/Node;>;
}
SourceFile: "ReferenceNodeSetData.java"