https://openjdk.java.net/ 
public interface org.w3c.dom.xpath.XPathNSResolver
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.w3c.dom.xpath.XPathNSResolver
  super_class: java.lang.Object
{
  public abstract java.lang.String lookupNamespaceURI(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      prefix  
}
SourceFile: "XPathNSResolver.java"