https://openjdk.java.net/ 
public interface com.sun.org.apache.xml.internal.security.keys.content.keyvalues.KeyValueContent
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.org.apache.xml.internal.security.keys.content.keyvalues.KeyValueContent
  super_class: java.lang.Object
{
  public abstract java.security.PublicKey getPublicKey();
    descriptor: ()Ljava/security/PublicKey;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException
}
SourceFile: "KeyValueContent.java"