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Since EMF 2.2, you can use XMLProcessor to instantiate an in-memory model from an XML Schema, then use <code>Diagnostician.validate()</code> to validate an XML instance document to ensure it complies with that schema.

For example, here's some code derived from the [http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.releng.basebuilder/plugins/org.eclipse.build.tools/src_rss/org/eclipse/releng/util/rss/emf/Attic/?only_with_tag=releng_test RSSFeedValidatorDynamicTask]. You can also generate code using EMF, then use that generated code to validate using something like [http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.releng.basebuilder/plugins/org.eclipse.build.tools/src_rss/org/eclipse/releng/util/rss/emf/Attic/?only_with_tag=releng_test RSSFeedValidatorGeneratedTask]

 /**
  * <copyright>
  *
  * Copyright (c) 2005 IBM Corporation and others.
  * All rights reserved.   This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  * 
  * Contributors: 
  *   IBM - Initial API and implementation
  *
  * </copyright>
  *
  * $Id$
  */
 
 import java.io.File;
 import java.util.Iterator;
 
 import org.eclipse.emf.common.util.Diagnostic;
 import org.eclipse.emf.common.util.URI;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.resource.Resource;
 import org.eclipse.emf.ecore.util.Diagnostician;
 import org.eclipse.emf.ecore.xmi.util.XMLProcessor;
 
 public class Validator
 {
 
   public static void main(String[] args)
   {
       String xsdFile = "[http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.releng.basebuilder/plugins/org.eclipse.build.tools/schema/?only_with_tag=releng_test schema/atom10_build.xsd]";
       String xmlFile = "[http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.releng.basebuilder/plugins/org.eclipse.build.tools/data/?only_with_tag=releng_test data/builds-eclipse.xml]";
       org.eclipse.emf.common.util.URI xsdURI = null;
       XMLProcessor processor = null;
       Resource resource = null;
       try
       {
         xsdURI = URI.createFileURI((new File(xsdFile)).getCanonicalPath());
         processor = new XMLProcessor(xsdURI);
         resource = processor.load(new File(xmlFile).getAbsolutePath(), null);
       }
       catch (Exception e)
       {
         e.printStackTrace();
       } 
       
       EObject document = (EObject)resource.getContents().get(0);
       EObject feed = (EObject)document.eGet(document.eClass().getEStructuralFeature("feed")); 
 
       Diagnostician validator = Diagnostician.INSTANCE;
 
       // Validate the feed and inspect the resulting diagnostic.
       Diagnostic diagnostic = validator.validate(feed);
       printDiagnostic(diagnostic, 0);
   }
 
   private static void printDiagnostic(Diagnostic diagnostic, int depth)
   {
     String message = null;
     switch (diagnostic.getSeverity())
     {
       case Diagnostic.OK:
       message = "OK";
         break;
       case Diagnostic.ERROR:
       message = "ERROR: " + diagnostic.getMessage();
         break;
       case Diagnostic.INFO:
       message = "INFO: " + diagnostic.getMessage();
         break;
     }
 
     for (int i = 0; i < depth; i++)
     {
       System.out.print(i == depth - 1 ? "-> " : "   ");
     }
     System.out.println(message);
 
     for (Iterator i = diagnostic.getChildren().iterator(); i.hasNext();)
     {
       printDiagnostic((Diagnostic)i.next(), depth + 1);
     }
   }
 
 }
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