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.Validator
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: javax.xml.validation.Validator
  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.Validator this
         0: .line 65
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 66
            return
        end local 0 // javax.xml.validation.Validator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Ljavax/xml/validation/Validator;

  public abstract void reset();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public void validate(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // javax.xml.validation.Validator this
        start local 1 // javax.xml.transform.Source source
         0: .line 94
            aload 0 /* this */
            aload 1 /* source */
            aconst_null
            invokevirtual javax.xml.validation.Validator.validate:(Ljavax/xml/transform/Source;Ljavax/xml/transform/Result;)V
         1: .line 95
            return
        end local 1 // javax.xml.transform.Source source
        end local 0 // javax.xml.validation.Validator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Ljavax/xml/validation/Validator;
            0    2     1  source  Ljavax/xml/transform/Source;
    Exceptions:
      throws org.xml.sax.SAXException, java.io.IOException
    MethodParameters:
        Name  Flags
      source  

  public abstract void validate(javax.xml.transform.Source, javax.xml.transform.Result);
    descriptor: (Ljavax/xml/transform/Source;Ljavax/xml/transform/Result;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws org.xml.sax.SAXException, java.io.IOException
    MethodParameters:
        Name  Flags
      source  
      result  

  public abstract void setErrorHandler(org.xml.sax.ErrorHandler);
    descriptor: (Lorg/xml/sax/ErrorHandler;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
              Name  Flags
      errorHandler  

  public abstract org.xml.sax.ErrorHandler getErrorHandler();
    descriptor: ()Lorg/xml/sax/ErrorHandler;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void setResourceResolver(org.w3c.dom.ls.LSResourceResolver);
    descriptor: (Lorg/w3c/dom/ls/LSResourceResolver;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                  Name  Flags
      resourceResolver  

  public abstract org.w3c.dom.ls.LSResourceResolver getResourceResolver();
    descriptor: ()Lorg/w3c/dom/ls/LSResourceResolver;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public boolean getFeature(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // javax.xml.validation.Validator this
        start local 1 // java.lang.String name
         0: .line 353
            aload 1 /* name */
            ifnonnull 1
            new java.lang.NullPointerException
            dup
            ldc "the name parameter is null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         1: .line 354
      StackMap locals:
      StackMap stack:
            new org.xml.sax.SAXNotRecognizedException
            dup
            aload 1 /* name */
            invokespecial org.xml.sax.SAXNotRecognizedException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.lang.String name
        end local 0 // javax.xml.validation.Validator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Ljavax/xml/validation/Validator;
            0    2     1  name  Ljava/lang/String;
    Exceptions:
      throws org.xml.sax.SAXNotRecognizedException, org.xml.sax.SAXNotSupportedException
    MethodParameters:
      Name  Flags
      name  

  public void setFeature(java.lang.String, boolean);
    descriptor: (Ljava/lang/String;Z)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // javax.xml.validation.Validator this
        start local 1 // java.lang.String name
        start local 2 // boolean value
         0: .line 386
            aload 1 /* name */
            ifnonnull 1
            new java.lang.NullPointerException
            dup
            ldc "the name parameter is null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         1: .line 387
      StackMap locals:
      StackMap stack:
            new org.xml.sax.SAXNotRecognizedException
            dup
            aload 1 /* name */
            invokespecial org.xml.sax.SAXNotRecognizedException.<init>:(Ljava/lang/String;)V
            athrow
        end local 2 // boolean value
        end local 1 // java.lang.String name
        end local 0 // javax.xml.validation.Validator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Ljavax/xml/validation/Validator;
            0    2     1   name  Ljava/lang/String;
            0    2     2  value  Z
    Exceptions:
      throws org.xml.sax.SAXNotRecognizedException, org.xml.sax.SAXNotSupportedException
    MethodParameters:
       Name  Flags
      name   
      value  

  public void setProperty(java.lang.String, java.lang.Object);
    descriptor: (Ljava/lang/String;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // javax.xml.validation.Validator this
        start local 1 // java.lang.String name
        start local 2 // java.lang.Object object
         0: .line 414
            aload 1 /* name */
            ifnonnull 1
            new java.lang.NullPointerException
            dup
            ldc "the name parameter is null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         1: .line 415
      StackMap locals:
      StackMap stack:
            new org.xml.sax.SAXNotRecognizedException
            dup
            aload 1 /* name */
            invokespecial org.xml.sax.SAXNotRecognizedException.<init>:(Ljava/lang/String;)V
            athrow
        end local 2 // java.lang.Object object
        end local 1 // java.lang.String name
        end local 0 // javax.xml.validation.Validator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Ljavax/xml/validation/Validator;
            0    2     1    name  Ljava/lang/String;
            0    2     2  object  Ljava/lang/Object;
    Exceptions:
      throws org.xml.sax.SAXNotRecognizedException, org.xml.sax.SAXNotSupportedException
    MethodParameters:
        Name  Flags
      name    
      object  

  public java.lang.Object getProperty(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // javax.xml.validation.Validator this
        start local 1 // java.lang.String name
         0: .line 445
            aload 1 /* name */
            ifnonnull 1
            new java.lang.NullPointerException
            dup
            ldc "the name parameter is null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         1: .line 446
      StackMap locals:
      StackMap stack:
            new org.xml.sax.SAXNotRecognizedException
            dup
            aload 1 /* name */
            invokespecial org.xml.sax.SAXNotRecognizedException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.lang.String name
        end local 0 // javax.xml.validation.Validator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Ljavax/xml/validation/Validator;
            0    2     1  name  Ljava/lang/String;
    Exceptions:
      throws org.xml.sax.SAXNotRecognizedException, org.xml.sax.SAXNotSupportedException
    MethodParameters:
      Name  Flags
      name  
}
SourceFile: "Validator.java"