http://xml.apache.org/commons/components/external/: xml-commons provides an Apache-hosted set of DOM, SAX, and JAXP interfaces for use in other xml-based projects. Our hope is that we can standardize on both a common version and packaging scheme for these critical XML standards interfaces to make the lives of both our developers and users easier. The External Components portion of xml-commons contains interfaces that are defined by external standards organizations. For DOM, that's the W3C; for SAX it's David Megginson and sax.sourceforge.net; for JAXP it's Sun. 
public abstract class javax.xml.validation.Schema
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: javax.xml.validation.Schema
  super_class: java.lang.Object
{
  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javax.xml.validation.Schema this
         0: .line 70
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 71
            return
        end local 0 // javax.xml.validation.Schema this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Ljavax/xml/validation/Schema;

  public abstract javax.xml.validation.Validator newValidator();
    descriptor: ()Ljavax/xml/validation/Validator;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract javax.xml.validation.ValidatorHandler newValidatorHandler();
    descriptor: ()Ljavax/xml/validation/ValidatorHandler;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "Schema.java"